231501456531 has 6 divisors (see below), whose sum is σ = 334390992780. Its totient is φ = 154334304348.

The previous prime is 231501456503. The next prime is 231501456569. The reversal of 231501456531 is 135654105132.

231501456531 is a `hidden beast` number, since 2 + 3 + 1 + 50 + 14 + 565 + 31 = 666.

It is not a de Polignac number, because 231501456531 - 2¹⁸ = 231501194387 is a prime.

It is a super-2 number, since 2×231501456531² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231581456531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12861192021 + ... + 12861192038.

It is an arithmetic number, because the mean of its divisors is an integer number (55731832130).

Almost surely, 2^231501456531 is an apocalyptic number.

231501456531 is a deficient number, since it is larger than the sum of its proper divisors (102889536249).

231501456531 is a wasteful number, since it uses less digits than its factorization.

231501456531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25722384065 (or 25722384062 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 231501456531 in words is "two hundred thirty-one billion, five hundred one million, four hundred fifty-six thousand, five hundred thirty-one".