31982121654 has 32 divisors (see below), whose sum is σ = 73129436160. Its totient is φ = 9134318592.

The previous prime is 31982121643. The next prime is 31982121673. The reversal of 31982121654 is 45612128913.

It is a super-2 number, since 2×31982121654² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28654 + ... + 254529.

It is an arithmetic number, because the mean of its divisors is an integer number (2285294880).

Almost surely, 2^31982121654 is an apocalyptic number.

31982121654 is an abundant number, since it is smaller than the sum of its proper divisors (41147314506).

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

31982121654 is a wasteful number, since it uses less digits than its factorization.

31982121654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285884.

The product of its digits is 103680, while the sum is 42.

The spelling of 31982121654 in words is "thirty-one billion, nine hundred eighty-two million, one hundred twenty-one thousand, six hundred fifty-four".