691972607 has 8 divisors (see below), whose sum is σ = 756312192. Its totient is φ = 630259200.

The previous prime is 691972559. The next prime is 691972627. The reversal of 691972607 is 706279196.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691972607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691972627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 655994 + ... + 657047.

It is an arithmetic number, because the mean of its divisors is an integer number (94539024).

Almost surely, 2^691972607 is an apocalyptic number.

691972607 is a deficient number, since it is larger than the sum of its proper divisors (64339585).

691972607 is a wasteful number, since it uses less digits than its factorization.

691972607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313089.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 691972607 is about 26305.3722079730. The cubic root of 691972607 is about 884.4968708624.

The spelling of 691972607 in words is "six hundred ninety-one million, nine hundred seventy-two thousand, six hundred seven".