3157813 has 4 divisors (see below), whose sum is σ = 3161740. Its totient is φ = 3153888.

The previous prime is 3157811. The next prime is 3157829. The reversal of 3157813 is 3187513.

3157813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1203409 + 1954404 = 1097^2 + 1398^2 .

It is a cyclic number.

It is not a de Polignac number, because 3157813 - 2¹ = 3157811 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 (3157811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270 + ... + 2527.

It is an arithmetic number, because the mean of its divisors is an integer number (790435).

Almost surely, 2^3157813 is an apocalyptic number.

It is an amenable number.

3157813 is a deficient number, since it is larger than the sum of its proper divisors (3927).

3157813 is a wasteful number, since it uses less digits than its factorization.

3157813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3926.

The product of its digits is 2520, while the sum is 28.

The square root of 3157813 is about 1777.0236351833. The cubic root of 3157813 is about 146.7108171719.

It can be divided in two parts, 315 and 7813, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 3157813 in words is "three million, one hundred fifty-seven thousand, eight hundred thirteen".