691941969 has 12 divisors (see below), whose sum is σ = 1000346256. Its totient is φ = 460891032.

The previous prime is 691941937. The next prime is 691941989. The reversal of 691941969 is 969149196.

It is not a de Polignac number, because 691941969 - 2⁵ = 691941937 is a prime.

It is a super-2 number, since 2×691941969² = 957567376927193922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (691941989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22587 + ... + 43520.

It is an arithmetic number, because the mean of its divisors is an integer number (83362188).

Almost surely, 2^691941969 is an apocalyptic number.

It is an amenable number.

691941969 is a deficient number, since it is larger than the sum of its proper divisors (308404287).

691941969 is a wasteful number, since it uses less digits than its factorization.

691941969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67276 (or 67273 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 691941969 is about 26304.7898489990. The cubic root of 691941969 is about 884.4838165811.

The spelling of 691941969 in words is "six hundred ninety-one million, nine hundred forty-one thousand, nine hundred sixty-nine".