690991359 has 16 divisors (see below), whose sum is σ = 926128224. Its totient is φ = 458265600.

The previous prime is 690991349. The next prime is 690991397. The reversal of 690991359 is 953199096.

It is not a de Polignac number, because 690991359 - 2²⁴ = 674214143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690991319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 676269 + ... + 677289.

It is an arithmetic number, because the mean of its divisors is an integer number (57883014).

Almost surely, 2^690991359 is an apocalyptic number.

690991359 is a deficient number, since it is larger than the sum of its proper divisors (235136865).

690991359 is a wasteful number, since it uses less digits than its factorization.

690991359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978.

The product of its (nonzero) digits is 590490, while the sum is 51.

The square root of 690991359 is about 26286.7144961100. The cubic root of 690991359 is about 884.0785877561.

The spelling of 690991359 in words is "six hundred ninety million, nine hundred ninety-one thousand, three hundred fifty-nine".