908136631813 has 2 divisors, whose sum is σ = 908136631814. Its totient is φ = 908136631812.

The previous prime is 908136631799. The next prime is 908136631817. The reversal of 908136631813 is 318136631809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 790217879364 + 117918752449 = 888942^2 + 343393^2 .

It is an emirp because it is prime and its reverse (318136631809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 908136631813 - 2²¹ = 908134534661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (908136631817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454068315906 + 454068315907.

It is an arithmetic number, because the mean of its divisors is an integer number (454068315907).

Almost surely, 2^908136631813 is an apocalyptic number.

It is an amenable number.

908136631813 is a deficient number, since it is larger than the sum of its proper divisors (1).

908136631813 is an equidigital number, since it uses as much as digits as its factorization.

908136631813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 49.

It can be divided in two parts, 908 and 136631813, that added together give a square (136632721 = 11689²).

The spelling of 908136631813 in words is "nine hundred eight billion, one hundred thirty-six million, six hundred thirty-one thousand, eight hundred thirteen".