690956939 has 2 divisors, whose sum is σ = 690956940. Its totient is φ = 690956938.

The previous prime is 690956933. The next prime is 690956941. The reversal of 690956939 is 939659096.

690956939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 690956939 - 2²⁰ = 689908363 is a prime.

It is a Sophie Germain prime.

Together with 690956941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (690956933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345478469 + 345478470.

It is an arithmetic number, because the mean of its divisors is an integer number (345478470).

Almost surely, 2^690956939 is an apocalyptic number.

690956939 is a deficient number, since it is larger than the sum of its proper divisors (1).

690956939 is an equidigital number, since it uses as much as digits as its factorization.

690956939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3542940, while the sum is 56.

The square root of 690956939 is about 26286.0597846083. The cubic root of 690956939 is about 884.0639081272.

The spelling of 690956939 in words is "six hundred ninety million, nine hundred fifty-six thousand, nine hundred thirty-nine".