641222877 has 4 divisors (see below), whose sum is σ = 854963840. Its totient is φ = 427481916.

The previous prime is 641222867. The next prime is 641222921. The reversal of 641222877 is 778222146.

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 not a de Polignac number, because 641222877 - 2⁷ = 641222749 is a prime.

It is a super-2 number, since 2×641222877² = 822333555976314258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641222867) 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, 106870477 + ... + 106870482.

It is an arithmetic number, because the mean of its divisors is an integer number (213740960).

Almost surely, 2^641222877 is an apocalyptic number.

It is an amenable number.

641222877 is a deficient number, since it is larger than the sum of its proper divisors (213740963).

641222877 is a wasteful number, since it uses less digits than its factorization.

641222877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213740962.

The product of its digits is 75264, while the sum is 39.

The square root of 641222877 is about 25322.3789759177. The cubic root of 641222877 is about 862.3224035935.

The spelling of 641222877 in words is "six hundred forty-one million, two hundred twenty-two thousand, eight hundred seventy-seven".