641570451 has 16 divisors (see below), whose sum is σ = 913474560. Its totient is φ = 399641760.

The previous prime is 641570399. The next prime is 641570453. The reversal of 641570451 is 154075146.

It is not a de Polignac number, because 641570451 - 2⁶ = 641570387 is a prime.

It is a super-2 number, since 2×641570451² = 823225287192686802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641570453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116245 + ... + 121638.

It is an arithmetic number, because the mean of its divisors is an integer number (57092160).

Almost surely, 2^641570451 is an apocalyptic number.

641570451 is a deficient number, since it is larger than the sum of its proper divisors (271904109).

641570451 is a wasteful number, since it uses less digits than its factorization.

641570451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237946.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 641570451 is about 25329.2410269238. The cubic root of 641570451 is about 862.4781823509.

The spelling of 641570451 in words is "six hundred forty-one million, five hundred seventy thousand, four hundred fifty-one".