690812929 has 4 divisors (see below), whose sum is σ = 693271620. Its totient is φ = 688354240.

The previous prime is 690812921. The next prime is 690812953. The reversal of 690812929 is 929218096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 359026704 + 331786225 = 18948^2 + 18215^2 .

It is a cyclic number.

It is not a de Polignac number, because 690812929 - 2³ = 690812921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690812921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1228924 + ... + 1229485.

It is an arithmetic number, because the mean of its divisors is an integer number (173317905).

Almost surely, 2^690812929 is an apocalyptic number.

It is an amenable number.

690812929 is a deficient number, since it is larger than the sum of its proper divisors (2458691).

690812929 is a wasteful number, since it uses less digits than its factorization.

690812929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2458690.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 690812929 is about 26283.3203572151. The cubic root of 690812929 is about 884.0024846712.

It can be divided in two parts, 69081 and 2929, that added together give a triangular number (72010 = T₃₇₉).

The spelling of 690812929 in words is "six hundred ninety million, eight hundred twelve thousand, nine hundred twenty-nine".