31055813 has 4 divisors (see below), whose sum is σ = 31157280. Its totient is φ = 30954348.

The previous prime is 31055789. The next prime is 31055833. The reversal of 31055813 is 31855013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31055813 - 2¹² = 31051717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31055833) 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 in 3 ways as a sum of consecutive naturals, for example, 50273 + ... + 50886.

It is an arithmetic number, because the mean of its divisors is an integer number (7789320).

Almost surely, 2^31055813 is an apocalyptic number.

It is an amenable number.

31055813 is a deficient number, since it is larger than the sum of its proper divisors (101467).

31055813 is a wasteful number, since it uses less digits than its factorization.

31055813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101466.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 31055813 is about 5572.7742642242. The cubic root of 31055813 is about 314.3264789607.

The spelling of 31055813 in words is "thirty-one million, fifty-five thousand, eight hundred thirteen".