31922611561 has 27 divisors (see below), whose sum is σ = 33948312879. Its totient is φ = 30016392000.

The previous prime is 31922611499. The next prime is 31922611583. The reversal of 31922611561 is 16511622913.

The square root of 31922611561 is 178669.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 15758031961 + 16164579600 = 125531^2 + 127140^2 .

It is not a de Polignac number, because 31922611561 - 2⁷ = 31922611433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31922611561.

It is not an unprimeable number, because it can be changed into a prime (31922611261) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 316065411 + ... + 316065511.

Almost surely, 2^31922611561 is an apocalyptic number.

31922611561 is the 178669-th square number.

31922611561 is the 89335-th centered octagonal number.

It is an amenable number.

31922611561 is a deficient number, since it is larger than the sum of its proper divisors (2025701318).

31922611561 is an frugal number, since it uses more digits than its factorization.

31922611561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 191 counting only the distinct ones).

The product of its digits is 19440, while the sum is 37.

The spelling of 31922611561 in words is "thirty-one billion, nine hundred twenty-two million, six hundred eleven thousand, five hundred sixty-one".