31072170529 has 9 divisors (see below), whose sum is σ = 33010645017. Its totient is φ = 29241575424.

The previous prime is 31072170523. The next prime is 31072170533. The reversal of 31072170529 is 92507127013.

The square root of 31072170529 is 176273.

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

It can be written as a sum of positive squares in 4 ways, for example, as 1951430625 + 29120739904 = 44175^2 + 170648^2 .

It is not a de Polignac number, because 31072170529 - 2¹⁷ = 31072039457 is a prime.

It is a super-2 number, since 2×31072170529² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31072170523) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2991457 + ... + 3001825.

Almost surely, 2^31072170529 is an apocalyptic number.

31072170529 is the 176273-rd square number.

31072170529 is the 88137-th centered octagonal number.

It is an amenable number.

31072170529 is a deficient number, since it is larger than the sum of its proper divisors (1938474488).

31072170529 is an frugal number, since it uses more digits than its factorization.

31072170529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20772 (or 10386 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 37.

It can be divided in two parts, 31072 and 170529, that added together give a square (201601 = 449²).

The spelling of 31072170529 in words is "thirty-one billion, seventy-two million, one hundred seventy thousand, five hundred twenty-nine".