31491958 has 16 divisors (see below), whose sum is σ = 49343760. Its totient is φ = 15058656.

The previous prime is 31491917. The next prime is 31491959. The reversal of 31491958 is 85919413.

It is a self number, because there is not a number n which added to its sum of digits gives 31491958.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31491959) 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, 760 + ... + 7972.

It is an arithmetic number, because the mean of its divisors is an integer number (3083985).

Almost surely, 2^31491958 is an apocalyptic number.

31491958 is a deficient number, since it is larger than the sum of its proper divisors (17851802).

31491958 is a wasteful number, since it uses less digits than its factorization.

31491958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7311.

The product of its digits is 38880, while the sum is 40.

The square root of 31491958 is about 5611.7695961256. The cubic root of 31491958 is about 315.7911013181.

The spelling of 31491958 in words is "thirty-one million, four hundred ninety-one thousand, nine hundred fifty-eight".