2145331231 has 8 divisors (see below), whose sum is σ = 2220602400. Its totient is φ = 2070146400.

The previous prime is 2145331207. The next prime is 2145331247. The reversal of 2145331231 is 1321335412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145331231 is a prime.

It is a super-2 number, since 2×2145331231² = 9204892181407950722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2145331196 and 2145331205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145338231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31206 + ... + 72556.

It is an arithmetic number, because the mean of its divisors is an integer number (277575300).

Almost surely, 2^2145331231 is an apocalyptic number.

2145331231 is a deficient number, since it is larger than the sum of its proper divisors (75271169).

2145331231 is a wasteful number, since it uses less digits than its factorization.

2145331231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43169.

The product of its digits is 2160, while the sum is 25.

The square root of 2145331231 is about 46317.7204857925. The cubic root of 2145331231 is about 1289.7279700016.

Adding to 2145331231 its reverse (1321335412), we get a palindrome (3466666643).

The spelling of 2145331231 in words is "two billion, one hundred forty-five million, three hundred thirty-one thousand, two hundred thirty-one".