31197490 has 8 divisors (see below), whose sum is σ = 56155500. Its totient is φ = 12478992.

The previous prime is 31197479. The next prime is 31197493. The reversal of 31197490 is 9479113.

It can be written as a sum of positive squares in 2 ways, for example, as 25613721 + 5583769 = 5061^2 + 2363^2 .

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

It is not an unprimeable number, because it can be changed into a prime (31197493) by changing a digit.

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, 1559865 + ... + 1559884.

Almost surely, 2^31197490 is an apocalyptic number.

31197490 is a deficient number, since it is larger than the sum of its proper divisors (24958010).

31197490 is a wasteful number, since it uses less digits than its factorization.

31197490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3119756.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 31197490 is about 5585.4713319468. The cubic root of 31197490 is about 314.8037410210.

It can be divided in two parts, 3119 and 7490, that added together give a square (10609 = 103²).

The spelling of 31197490 in words is "thirty-one million, one hundred ninety-seven thousand, four hundred ninety".