31381059609 has 23 divisors (see below), whose sum is σ = 47071589413. Its totient is φ = 20920706406.

The previous prime is 31381059607. The next prime is 31381059613. The reversal of 31381059609 is 90695018313.

The square root of 31381059609 is 177147.

It is a perfect power (a square, a 11-th power, a 22-nd power), and thus also a powerful number.

31381059609 is a `hidden beast` number, since 3 + 1 + 38 + 1 + 0 + 5 + 9 + 609 = 666.

It is an ABA number since it can be written as A⋅B^A, here for A=3, B=2187.

It is not a de Polignac number, because 31381059609 - 2¹ = 31381059607 is a prime.

It is a super-2 number, since 2×31381059609² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an enlightened number because it begins with the concatenation of its prime factors (3).

It is a nialpdrome in base 3 and base 9.

It is not an unprimeable number, because it can be changed into a prime (31381059601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 22 ways as a sum of consecutive naturals, for example, 10460353202 + 10460353203 + 10460353204.

Almost surely, 2^31381059609 is an apocalyptic number.

31381059609 is the 177147-th square number.

31381059609 is the 88574-th centered octagonal number.

It is an amenable number.

31381059609 is a deficient number, since it is larger than the sum of its proper divisors (15690529804).

31381059609 is an frugal number, since it uses more digits than its factorization.

31381059609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66 (or 3 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 31381059609 in words is "thirty-one billion, three hundred eighty-one million, fifty-nine thousand, six hundred nine".