231143007771540 has 144 divisors (see below), whose sum is σ = 738048983992320. Its totient is φ = 58392961585920.

The previous prime is 231143007771503. The next prime is 231143007771551. The reversal of 231143007771540 is 45177700341132.

231143007771540 is a `hidden beast` number, since 2 + 3 + 1 + 1 + 4 + 30 + 0 + 7 + 7 + 71 + 540 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 196840950 + ... + 198011730.

Almost surely, 2^{231143007771540} is an apocalyptic number.

231143007771540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231143007771540 is an abundant number, since it is smaller than the sum of its proper divisors (506905976220780).

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

231143007771540 is a wasteful number, since it uses less digits than its factorization.

231143007771540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228542 (or 1228537 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 45.

The spelling of 231143007771540 in words is "two hundred thirty-one trillion, one hundred forty-three billion, seven million, seven hundred seventy-one thousand, five hundred forty".