31730653161 has 9 divisors (see below), whose sum is σ = 45833937591. Its totient is φ = 21153412512.

The previous prime is 31730653139. The next prime is 31730653169. The reversal of 31730653161 is 16135603713.

It is a happy number.

The square root of 31730653161 is 178131.

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

31730653161 is a `hidden beast` number, since 31 + 7 + 30 + 6 + 531 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 29020826025 + 2709827136 = 170355^2 + 52056^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 31730653161 - 2¹³ = 31730644969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31730653169) 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, 504705 + ... + 564081.

Almost surely, 2^31730653161 is an apocalyptic number.

31730653161 is the 178131-st square number.

31730653161 is the 89066-th centered octagonal number.

It is an amenable number.

31730653161 is a deficient number, since it is larger than the sum of its proper divisors (14103284430).

31730653161 is an frugal number, since it uses more digits than its factorization.

31730653161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118760 (or 59380 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

Multiplying 31730653161 by its sum of digits (36), we get a square (1142303513796 = 1068786²).

The spelling of 31730653161 in words is "thirty-one billion, seven hundred thirty million, six hundred fifty-three thousand, one hundred sixty-one".