31661541 has 12 divisors (see below), whose sum is σ = 46313280. Its totient is φ = 20840040.

The previous prime is 31661537. The next prime is 31661549. The reversal of 31661541 is 14516613.

31661541 is a `hidden beast` number, since 3 + 1 + 6 + 615 + 41 = 666.

It is not a de Polignac number, because 31661541 - 2² = 31661537 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21555 + ... + 22976.

It is an arithmetic number, because the mean of its divisors is an integer number (3859440).

Almost surely, 2^31661541 is an apocalyptic number.

It is an amenable number.

31661541 is a deficient number, since it is larger than the sum of its proper divisors (14651739).

31661541 is a wasteful number, since it uses less digits than its factorization.

31661541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44616 (or 44613 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 31661541 is about 5626.8588928460. The cubic root of 31661541 is about 316.3569279151.

The spelling of 31661541 in words is "thirty-one million, six hundred sixty-one thousand, five hundred forty-one".