2231531120 has 80 divisors (see below), whose sum is σ = 6385632960. Its totient is φ = 706240512.

The previous prime is 2231531077. The next prime is 2231531123. The reversal of 2231531120 is 211351322.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×2231531120³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2231531092 and 2231531101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231531123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145985 + ... + 160544.

It is an arithmetic number, because the mean of its divisors is an integer number (79820412).

Almost surely, 2^2231531120 is an apocalyptic number.

2231531120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2231531120 is an abundant number, since it is smaller than the sum of its proper divisors (4154101840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2231531120 is a wasteful number, since it uses less digits than its factorization.

2231531120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306562 (or 306556 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2231531120 is about 47239.0846651372. The cubic root of 2231531120 is about 1306.7754970903.

Adding to 2231531120 its reverse (211351322), we get a palindrome (2442882442).

It can be divided in two parts, 22315 and 31120, that added together give a palindrome (53435).

The spelling of 2231531120 in words is "two billion, two hundred thirty-one million, five hundred thirty-one thousand, one hundred twenty".