31196639 has 2 divisors, whose sum is σ = 31196640. Its totient is φ = 31196638.

The previous prime is 31196621. The next prime is 31196647. The reversal of 31196639 is 93669113.

It is a strong prime.

It is an emirp because it is prime and its reverse (93669113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31196639 is a prime.

It is a super-3 number, since 3×31196639³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31196699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15598319 + 15598320.

It is an arithmetic number, because the mean of its divisors is an integer number (15598320).

Almost surely, 2^31196639 is an apocalyptic number.

31196639 is a deficient number, since it is larger than the sum of its proper divisors (1).

31196639 is an equidigital number, since it uses as much as digits as its factorization.

31196639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 38.

The square root of 31196639 is about 5585.3951516433. The cubic root of 31196639 is about 314.8008786068.

The spelling of 31196639 in words is "thirty-one million, one hundred ninety-six thousand, six hundred thirty-nine".