641252071 has 4 divisors (see below), whose sum is σ = 675002200. Its totient is φ = 607501944.

The previous prime is 641252041. The next prime is 641252093. The reversal of 641252071 is 170252146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641252071 - 2²⁷ = 507034343 is a prime.

It is a super-2 number, since 2×641252071² = 822408437123578082, 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 (641252021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16875036 + ... + 16875073.

It is an arithmetic number, because the mean of its divisors is an integer number (168750550).

Almost surely, 2^641252071 is an apocalyptic number.

641252071 is a deficient number, since it is larger than the sum of its proper divisors (33750129).

641252071 is a wasteful number, since it uses less digits than its factorization.

641252071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33750128.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 641252071 is about 25322.9554159857. The cubic root of 641252071 is about 862.3354901811.

The spelling of 641252071 in words is "six hundred forty-one million, two hundred fifty-two thousand, seventy-one".