690931009 has 4 divisors (see below), whose sum is σ = 706999216. Its totient is φ = 674862804.

The previous prime is 690930967. The next prime is 690931013. The reversal of 690931009 is 900139096.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690931009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690931019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8034039 + ... + 8034124.

It is an arithmetic number, because the mean of its divisors is an integer number (176749804).

Almost surely, 2^690931009 is an apocalyptic number.

It is an amenable number.

690931009 is a deficient number, since it is larger than the sum of its proper divisors (16068207).

690931009 is a wasteful number, since it uses less digits than its factorization.

690931009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16068206.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 690931009 is about 26285.5665527681. The cubic root of 690931009 is about 884.0528490377.

The spelling of 690931009 in words is "six hundred ninety million, nine hundred thirty-one thousand, nine".