870131813 has 2 divisors, whose sum is σ = 870131814. Its totient is φ = 870131812.

The previous prime is 870131797. The next prime is 870131827. The reversal of 870131813 is 318131078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 641456929 + 228674884 = 25327^2 + 15122^2 .

It is a cyclic number.

It is not a de Polignac number, because 870131813 - 2⁴ = 870131797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 870131813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870131113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435065906 + 435065907.

It is an arithmetic number, because the mean of its divisors is an integer number (435065907).

Almost surely, 2^870131813 is an apocalyptic number.

It is an amenable number.

870131813 is a deficient number, since it is larger than the sum of its proper divisors (1).

870131813 is an equidigital number, since it uses as much as digits as its factorization.

870131813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 870131813 is about 29497.9967624922. The cubic root of 870131813 is about 954.6884807611.

The spelling of 870131813 in words is "eight hundred seventy million, one hundred thirty-one thousand, eight hundred thirteen".