231531454523109 has 32 divisors (see below), whose sum is σ = 335655506922624. Its totient is φ = 141114233825280.

The previous prime is 231531454523099. The next prime is 231531454523119. The reversal of 231531454523109 is 901325454135132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (231531454523099) and next prime (231531454523119).

It is not a de Polignac number, because 231531454523109 - 2²³ = 231531446134501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231531454523119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47725287 + ... + 52352324.

It is an arithmetic number, because the mean of its divisors is an integer number (10489234591332).

Almost surely, 2^{231531454523109} is an apocalyptic number.

It is an amenable number.

231531454523109 is a deficient number, since it is larger than the sum of its proper divisors (104124052399515).

231531454523109 is a wasteful number, since it uses less digits than its factorization.

231531454523109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100078197.

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 231531454523109 in words is "two hundred thirty-one trillion, five hundred thirty-one billion, four hundred fifty-four million, five hundred twenty-three thousand, one hundred nine".