31793991 has 8 divisors (see below), whose sum is σ = 42549504. Its totient is φ = 21117240.

The previous prime is 31793977. The next prime is 31793999. The reversal of 31793991 is 19939713.

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

It is not a de Polignac number, because 31793991 - 2⁵ = 31793959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31793999) 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, 18741 + ... + 20366.

It is an arithmetic number, because the mean of its divisors is an integer number (5318688).

Almost surely, 2^31793991 is an apocalyptic number.

31793991 is a deficient number, since it is larger than the sum of its proper divisors (10755513).

31793991 is a wasteful number, since it uses less digits than its factorization.

31793991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39381.

The product of its digits is 45927, while the sum is 42.

The square root of 31793991 is about 5638.6160536075. The cubic root of 31793991 is about 316.7974537629.

The spelling of 31793991 in words is "thirty-one million, seven hundred ninety-three thousand, nine hundred ninety-one".