764972191 has 4 divisors (see below), whose sum is σ = 770038384. Its totient is φ = 759906000.

The previous prime is 764972123. The next prime is 764972233. The reversal of 764972191 is 191279467.

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

It is a cyclic number.

It is not a de Polignac number, because 764972191 - 2²⁵ = 731417759 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 (764972491) 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, 2532870 + ... + 2533171.

It is an arithmetic number, because the mean of its divisors is an integer number (192509596).

Almost surely, 2^764972191 is an apocalyptic number.

764972191 is a deficient number, since it is larger than the sum of its proper divisors (5066193).

764972191 is a wasteful number, since it uses less digits than its factorization.

764972191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5066192.

The product of its digits is 190512, while the sum is 46.

The square root of 764972191 is about 27658.1306490515. The cubic root of 764972191 is about 914.5663451148.

The spelling of 764972191 in words is "seven hundred sixty-four million, nine hundred seventy-two thousand, one hundred ninety-one".