31789961 has 8 divisors (see below), whose sum is σ = 36542784. Its totient is φ = 27090000.

The previous prime is 31789957. The next prime is 31789969. The reversal of 31789961 is 16998713.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31789961 - 2² = 31789957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31789969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11915 + ... + 14336.

It is an arithmetic number, because the mean of its divisors is an integer number (4567848).

Almost surely, 2^31789961 is an apocalyptic number.

It is an amenable number.

31789961 is a deficient number, since it is larger than the sum of its proper divisors (4752823).

31789961 is a wasteful number, since it uses less digits than its factorization.

31789961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26431.

The product of its digits is 81648, while the sum is 44.

The square root of 31789961 is about 5638.2586850906. The cubic root of 31789961 is about 316.7840681342.

The spelling of 31789961 in words is "thirty-one million, seven hundred eighty-nine thousand, nine hundred sixty-one".