31379191 has 4 divisors (see below), whose sum is σ = 31390432. Its totient is φ = 31367952.

The previous prime is 31379177. The next prime is 31379239. The reversal of 31379191 is 19197313.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31379191 - 2²¹ = 29282039 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 (31379591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2131 + ... + 8203.

It is an arithmetic number, because the mean of its divisors is an integer number (7847608).

Almost surely, 2^31379191 is an apocalyptic number.

31379191 is a deficient number, since it is larger than the sum of its proper divisors (11241).

31379191 is an equidigital number, since it uses as much as digits as its factorization.

31379191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11240.

The product of its digits is 5103, while the sum is 34.

The square root of 31379191 is about 5601.7132200783. The cubic root of 31379191 is about 315.4137202613.

The spelling of 31379191 in words is "thirty-one million, three hundred seventy-nine thousand, one hundred ninety-one".