31554021540 has 48 divisors (see below), whose sum is σ = 92192623488. Its totient is φ = 8048561664.

The previous prime is 31554021509. The next prime is 31554021547. The reversal of 31554021540 is 4512045513.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 31554021498 and 31554021507.

It is not an unprimeable number, because it can be changed into a prime (31554021547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11431237 + ... + 11433996.

It is an arithmetic number, because the mean of its divisors is an integer number (1920679656).

Almost surely, 2^31554021540 is an apocalyptic number.

31554021540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31554021540 is an abundant number, since it is smaller than the sum of its proper divisors (60638601948).

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

31554021540 is a wasteful number, since it uses less digits than its factorization.

31554021540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22865268 (or 22865266 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 31554021540 in words is "thirty-one billion, five hundred fifty-four million, twenty-one thousand, five hundred forty".