231137040 has 80 divisors (see below), whose sum is σ = 733220928. Its totient is φ = 60200448.

The previous prime is 231137029. The next prime is 231137077. The reversal of 231137040 is 40731132.

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

It is a junction number, because it is equal to n+sod(n) for n = 231136998 and 231137016.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 879 + ... + 21518.

Almost surely, 2^231137040 is an apocalyptic number.

231137040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231137040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (366610464).

231137040 is an abundant number, since it is smaller than the sum of its proper divisors (502083888).

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

231137040 is a wasteful number, since it uses less digits than its factorization.

231137040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22456 (or 22450 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 231137040 is about 15203.1917701514. The cubic root of 231137040 is about 613.7005546118.

Adding to 231137040 its reverse (40731132), we get a palindrome (271868172).

The spelling of 231137040 in words is "two hundred thirty-one million, one hundred thirty-seven thousand, forty".