31491974 has 8 divisors (see below), whose sum is σ = 48243168. Its totient is φ = 15410920.

The previous prime is 31491959. The next prime is 31491983. The reversal of 31491974 is 47919413.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167417 + ... + 167604.

It is an arithmetic number, because the mean of its divisors is an integer number (6030396).

Almost surely, 2^31491974 is an apocalyptic number.

31491974 is a deficient number, since it is larger than the sum of its proper divisors (16751194).

31491974 is a wasteful number, since it uses less digits than its factorization.

31491974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335070.

The product of its digits is 27216, while the sum is 38.

The square root of 31491974 is about 5611.7710217007. The cubic root of 31491974 is about 315.7911547990.

It can be divided in two parts, 3149 and 1974, that multiplied together give a palindrome (6216126).

The spelling of 31491974 in words is "thirty-one million, four hundred ninety-one thousand, nine hundred seventy-four".