31126639 has 2 divisors, whose sum is σ = 31126640. Its totient is φ = 31126638.

The previous prime is 31126619. The next prime is 31126661. The reversal of 31126639 is 93662113.

It is a weak prime.

It is an emirp because it is prime and its reverse (93662113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31126639 - 2⁵ = 31126607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31126639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31126619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15563319 + 15563320.

It is an arithmetic number, because the mean of its divisors is an integer number (15563320).

Almost surely, 2^31126639 is an apocalyptic number.

31126639 is a deficient number, since it is larger than the sum of its proper divisors (1).

31126639 is an equidigital number, since it uses as much as digits as its factorization.

31126639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 31.

The square root of 31126639 is about 5579.1252898640. The cubic root of 31126639 is about 314.5652489095.

The spelling of 31126639 in words is "thirty-one million, one hundred twenty-six thousand, six hundred thirty-nine".