771991423 has 12 divisors (see below), whose sum is σ = 899859000. Its totient is φ = 660359952.

The previous prime is 771991393. The next prime is 771991433. The reversal of 771991423 is 324199177.

It is a happy number.

It is not a de Polignac number, because 771991423 - 2⁵ = 771991391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 771991423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (771991433) 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, 8665 + ... + 40237.

It is an arithmetic number, because the mean of its divisors is an integer number (74988250).

Almost surely, 2^771991423 is an apocalyptic number.

771991423 is a deficient number, since it is larger than the sum of its proper divisors (127867577).

771991423 is a wasteful number, since it uses less digits than its factorization.

771991423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32086 (or 32079 counting only the distinct ones).

The product of its digits is 95256, while the sum is 43.

The square root of 771991423 is about 27784.7336319786. The cubic root of 771991423 is about 917.3551253556.

The spelling of 771991423 in words is "seven hundred seventy-one million, nine hundred ninety-one thousand, four hundred twenty-three".