641021057 has 8 divisors (see below), whose sum is σ = 685073376. Its totient is φ = 597673792.

The previous prime is 641021053. The next prime is 641021083. The reversal of 641021057 is 750120146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641021057 - 2² = 641021053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641021053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174383 + ... + 178020.

It is an arithmetic number, because the mean of its divisors is an integer number (85634172).

Almost surely, 2^641021057 is an apocalyptic number.

It is an amenable number.

641021057 is a deficient number, since it is larger than the sum of its proper divisors (44052319).

641021057 is a wasteful number, since it uses less digits than its factorization.

641021057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352527.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 641021057 is about 25318.3936496769. The cubic root of 641021057 is about 862.2319243048.

The spelling of 641021057 in words is "six hundred forty-one million, twenty-one thousand, fifty-seven".