30731661 has 6 divisors (see below), whose sum is σ = 44390190. Its totient is φ = 20487768.

The previous prime is 30731653. The next prime is 30731669. The reversal of 30731661 is 16613703.

It is an interprime number because it is at equal distance from previous prime (30731653) and next prime (30731669).

It can be written as a sum of positive squares in only one way, i.e., 23474025 + 7257636 = 4845^2 + 2694^2 .

It is not a de Polignac number, because 30731661 - 2³ = 30731653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30731669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1707306 + ... + 1707323.

It is an arithmetic number, because the mean of its divisors is an integer number (7398365).

Almost surely, 2^30731661 is an apocalyptic number.

It is an amenable number.

30731661 is a deficient number, since it is larger than the sum of its proper divisors (13658529).

30731661 is a wasteful number, since it uses less digits than its factorization.

30731661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3414635 (or 3414632 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 30731661 is about 5543.6144346446. The cubic root of 30731661 is about 313.2290341204.

The spelling of 30731661 in words is "thirty million, seven hundred thirty-one thousand, six hundred sixty-one".