641051957 has 12 divisors (see below), whose sum is σ = 803076876. Its totient is φ = 507205440.

The previous prime is 641051953. The next prime is 641052011. The reversal of 641051957 is 759150146.

It can be written as a sum of positive squares in 2 ways, for example, as 95082001 + 545969956 = 9751^2 + 23366^2 .

It is not a de Polignac number, because 641051957 - 2² = 641051953 is a prime.

It is a super-2 number, since 2×641051957² = 821895223147059698, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641051957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641051953) 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, 502544 + ... + 503817.

It is an arithmetic number, because the mean of its divisors is an integer number (66923073).

Almost surely, 2^641051957 is an apocalyptic number.

It is an amenable number.

641051957 is a deficient number, since it is larger than the sum of its proper divisors (162024919).

641051957 is a wasteful number, since it uses less digits than its factorization.

641051957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006388 (or 1006381 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 641051957 is about 25319.0038706107. The cubic root of 641051957 is about 862.2457785239.

The spelling of 641051957 in words is "six hundred forty-one million, fifty-one thousand, nine hundred fifty-seven".