31743661 has 16 divisors (see below), whose sum is σ = 35251200. Its totient is φ = 28461888.

The previous prime is 31743643. The next prime is 31743667. The reversal of 31743661 is 16634713.

It is a cyclic number.

It is not a de Polignac number, because 31743661 - 2⁷ = 31743533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31743667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28660 + ... + 29746.

It is an arithmetic number, because the mean of its divisors is an integer number (2203200).

Almost surely, 2^31743661 is an apocalyptic number.

It is an amenable number.

31743661 is a deficient number, since it is larger than the sum of its proper divisors (3507539).

31743661 is a wasteful number, since it uses less digits than its factorization.

31743661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188.

The product of its digits is 9072, while the sum is 31.

The square root of 31743661 is about 5634.1513114222. The cubic root of 31743661 is about 316.6302016491.

The spelling of 31743661 in words is "thirty-one million, seven hundred forty-three thousand, six hundred sixty-one".