231503435531 has 4 divisors (see below), whose sum is σ = 231758677272. Its totient is φ = 231248193792.

The previous prime is 231503435509. The next prime is 231503435551. The reversal of 231503435531 is 135534305132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231503435531 - 2³⁰ = 230429693707 is a prime.

It is a super-2 number, since 2×231503435531² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231503435491 and 231503435500.

It is not an unprimeable number, because it can be changed into a prime (231503435551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127619510 + ... + 127621323.

It is an arithmetic number, because the mean of its divisors is an integer number (57939669318).

Almost surely, 2^231503435531 is an apocalyptic number.

231503435531 is a deficient number, since it is larger than the sum of its proper divisors (255241741).

231503435531 is an equidigital number, since it uses as much as digits as its factorization.

231503435531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255241740.

The product of its (nonzero) digits is 81000, while the sum is 35.

The spelling of 231503435531 in words is "two hundred thirty-one billion, five hundred three million, four hundred thirty-five thousand, five hundred thirty-one".