690715813 has 2 divisors, whose sum is σ = 690715814. Its totient is φ = 690715812.

The previous prime is 690715811. The next prime is 690715847. The reversal of 690715813 is 318517096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 649332324 + 41383489 = 25482^2 + 6433^2 .

It is a cyclic number.

It is not a de Polignac number, because 690715813 - 2¹ = 690715811 is a prime.

Together with 690715811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690715811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345357906 + 345357907.

It is an arithmetic number, because the mean of its divisors is an integer number (345357907).

Almost surely, 2^690715813 is an apocalyptic number.

It is an amenable number.

690715813 is a deficient number, since it is larger than the sum of its proper divisors (1).

690715813 is an equidigital number, since it uses as much as digits as its factorization.

690715813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 690715813 is about 26281.4728088058. The cubic root of 690715813 is about 883.9610577257.

The spelling of 690715813 in words is "six hundred ninety million, seven hundred fifteen thousand, eight hundred thirteen".