771634421 has 4 divisors (see below), whose sum is σ = 772012332. Its totient is φ = 771256512.

The previous prime is 771634417. The next prime is 771634427. The reversal of 771634421 is 124436177.

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

It can be written as a sum of positive squares in 2 ways, for example, as 120670225 + 650964196 = 10985^2 + 25514^2 .

It is a cyclic number.

It is not a de Polignac number, because 771634421 - 2² = 771634417 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 (771634427) 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, 185876 + ... + 189981.

It is an arithmetic number, because the mean of its divisors is an integer number (193003083).

Almost surely, 2^771634421 is an apocalyptic number.

It is an amenable number.

771634421 is a deficient number, since it is larger than the sum of its proper divisors (377911).

771634421 is a wasteful number, since it uses less digits than its factorization.

771634421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377910.

The product of its digits is 28224, while the sum is 35.

The square root of 771634421 is about 27778.3084618196. The cubic root of 771634421 is about 917.2136954120.

The spelling of 771634421 in words is "seven hundred seventy-one million, six hundred thirty-four thousand, four hundred twenty-one".