231551431354440 has 48 divisors (see below), whose sum is σ = 752542151903100. Its totient is φ = 61747048361088.

The previous prime is 231551431354409. The next prime is 231551431354513. The reversal of 231551431354440 is 44453134155132.

231551431354440 is a `hidden beast` number, since 2 + 3 + 1 + 5 + 5 + 143 + 13 + 54 + 440 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 226993214894436 + 4558216460004 = 15066294^2 + 2134998^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 321599209855 + ... + 321599210574.

Almost surely, 2^{231551431354440} is an apocalyptic number.

231551431354440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231551431354440 is an abundant number, since it is smaller than the sum of its proper divisors (520990720548660).

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

231551431354440 is a wasteful number, since it uses less digits than its factorization.

231551431354440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643198420446 (or 643198420439 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 45.

The spelling of 231551431354440 in words is "two hundred thirty-one trillion, five hundred fifty-one billion, four hundred thirty-one million, three hundred fifty-four thousand, four hundred forty".