231520525240040 has 32 divisors (see below), whose sum is σ = 520944694240680. Its totient is φ = 92604030104832.

The previous prime is 231520525240009. The next prime is 231520525240111. The reversal of 231520525240040 is 40042525025132.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 231516856999684 + 3668240356 = 15215678^2 + 60566^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129727367 + ... + 131499926.

Almost surely, 2^{231520525240040} is an apocalyptic number.

231520525240040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231520525240040 is an abundant number, since it is smaller than the sum of its proper divisors (289424169000640).

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

231520525240040 is a wasteful number, since it uses less digits than its factorization.

231520525240040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261249461 (or 261249457 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

The spelling of 231520525240040 in words is "two hundred thirty-one trillion, five hundred twenty billion, five hundred twenty-five million, two hundred forty thousand, forty".