31996493 has 2 divisors, whose sum is σ = 31996494. Its totient is φ = 31996492.

The previous prime is 31996477. The next prime is 31996537. The reversal of 31996493 is 39469913.

It is an a-pointer prime, because the next prime (31996537) can be obtained adding 31996493 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24581764 + 7414729 = 4958^2 + 2723^2 .

It is a cyclic number.

It is not a de Polignac number, because 31996493 - 2⁴ = 31996477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31996403) 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 as a sum of consecutive naturals, namely, 15998246 + 15998247.

It is an arithmetic number, because the mean of its divisors is an integer number (15998247).

Almost surely, 2^31996493 is an apocalyptic number.

It is an amenable number.

31996493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31996493 is an equidigital number, since it uses as much as digits as its factorization.

31996493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 44.

The square root of 31996493 is about 5656.5442630638. The cubic root of 31996493 is about 317.4686120210.

The spelling of 31996493 in words is "thirty-one million, nine hundred ninety-six thousand, four hundred ninety-three".