634561377 has 4 divisors (see below), whose sum is σ = 846081840. Its totient is φ = 423040916.

The previous prime is 634561321. The next prime is 634561393. The reversal of 634561377 is 773165436.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 634561377 - 2²⁶ = 567452513 is a prime.

It is a super-2 number, since 2×634561377² = 805336282360272258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (634562377) 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, 105760227 + ... + 105760232.

It is an arithmetic number, because the mean of its divisors is an integer number (211520460).

Almost surely, 2^634561377 is an apocalyptic number.

It is an amenable number.

634561377 is a deficient number, since it is larger than the sum of its proper divisors (211520463).

634561377 is a wasteful number, since it uses less digits than its factorization.

634561377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211520462.

The product of its digits is 317520, while the sum is 42.

The square root of 634561377 is about 25190.5017218792. The cubic root of 634561377 is about 859.3258539600.

The spelling of 634561377 in words is "six hundred thirty-four million, five hundred sixty-one thousand, three hundred seventy-seven".