31045879 has 2 divisors, whose sum is σ = 31045880. Its totient is φ = 31045878.

The previous prime is 31045877. The next prime is 31045919. The reversal of 31045879 is 97854013.

It is a weak prime.

It is an emirp because it is prime and its reverse (97854013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31045879 - 2¹ = 31045877 is a prime.

Together with 31045877, it forms a pair of twin primes.

It is equal to p_1918639 and since 31045879 and 1918639 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31045877) 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, 15522939 + 15522940.

It is an arithmetic number, because the mean of its divisors is an integer number (15522940).

Almost surely, 2^31045879 is an apocalyptic number.

31045879 is a deficient number, since it is larger than the sum of its proper divisors (1).

31045879 is an equidigital number, since it uses as much as digits as its factorization.

31045879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 31045879 is about 5571.8828953954. The cubic root of 31045879 is about 314.2929602521.

The spelling of 31045879 in words is "thirty-one million, forty-five thousand, eight hundred seventy-nine".