641520771 has 16 divisors (see below), whose sum is σ = 866171904. Its totient is φ = 422299584.

The previous prime is 641520767. The next prime is 641520773. The reversal of 641520771 is 177025146.

It is not a de Polignac number, because 641520771 - 2² = 641520767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641520773) 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, 110575 + ... + 116231.

It is an arithmetic number, because the mean of its divisors is an integer number (54135744).

Almost surely, 2^641520771 is an apocalyptic number.

641520771 is a deficient number, since it is larger than the sum of its proper divisors (224651133).

641520771 is a wasteful number, since it uses less digits than its factorization.

641520771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6130.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 641520771 is about 25328.2603232042. The cubic root of 641520771 is about 862.4559197804.

The spelling of 641520771 in words is "six hundred forty-one million, five hundred twenty thousand, seven hundred seventy-one".