31791261 has 8 divisors (see below), whose sum is σ = 42698304. Its totient is φ = 21039200.

The previous prime is 31791247. The next prime is 31791283. The reversal of 31791261 is 16219713.

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

It is a cyclic number.

It is not a de Polignac number, because 31791261 - 2⁶ = 31791197 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 (31791961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38265 + ... + 39086.

It is an arithmetic number, because the mean of its divisors is an integer number (5337288).

Almost surely, 2^31791261 is an apocalyptic number.

It is an amenable number.

31791261 is a deficient number, since it is larger than the sum of its proper divisors (10907043).

31791261 is a wasteful number, since it uses less digits than its factorization.

31791261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77491.

The product of its digits is 2268, while the sum is 30.

The square root of 31791261 is about 5638.3739677322. The cubic root of 31791261 is about 316.7883862025.

The spelling of 31791261 in words is "thirty-one million, seven hundred ninety-one thousand, two hundred sixty-one".