690131969 has 4 divisors (see below), whose sum is σ = 698446896. Its totient is φ = 681817044.

The previous prime is 690131947. The next prime is 690131971. The reversal of 690131969 is 969131096.

It is a happy number.

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 not a de Polignac number, because 690131969 - 2¹² = 690127873 is a prime.

It is a super-2 number, since 2×690131969² = 952564269271633922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690131929) 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, 4157339 + ... + 4157504.

It is an arithmetic number, because the mean of its divisors is an integer number (174611724).

Almost surely, 2^690131969 is an apocalyptic number.

It is an amenable number.

690131969 is a deficient number, since it is larger than the sum of its proper divisors (8314927).

690131969 is an equidigital number, since it uses as much as digits as its factorization.

690131969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8314926.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 690131969 is about 26270.3629400128. The cubic root of 690131969 is about 883.7119244679.

The spelling of 690131969 in words is "six hundred ninety million, one hundred thirty-one thousand, nine hundred sixty-nine".