641402527 has 4 divisors (see below), whose sum is σ = 647629840. Its totient is φ = 635175216.

The previous prime is 641402521. The next prime is 641402557. The reversal of 641402527 is 725204146.

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 641402527 - 2¹⁵ = 641369759 is a prime.

It is a super-2 number, since 2×641402527² = 822794403283971458, 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 (641402521) 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, 3113502 + ... + 3113707.

It is an arithmetic number, because the mean of its divisors is an integer number (161907460).

Almost surely, 2^641402527 is an apocalyptic number.

641402527 is a deficient number, since it is larger than the sum of its proper divisors (6227313).

641402527 is a wasteful number, since it uses less digits than its factorization.

641402527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6227312.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 641402527 is about 25325.9259850454. The cubic root of 641402527 is about 862.4029277295.

The spelling of 641402527 in words is "six hundred forty-one million, four hundred two thousand, five hundred twenty-seven".