641969579 has 4 divisors (see below), whose sum is σ = 642025176. Its totient is φ = 641913984.

The previous prime is 641969567. The next prime is 641969597. The reversal of 641969579 is 975969146.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641969579 is a prime.

It is a super-2 number, since 2×641969579² = 824249880722874482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641969539) 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, 3254 + ... + 35979.

It is an arithmetic number, because the mean of its divisors is an integer number (160506294).

Almost surely, 2^641969579 is an apocalyptic number.

641969579 is a deficient number, since it is larger than the sum of its proper divisors (55597).

641969579 is a wasteful number, since it uses less digits than its factorization.

641969579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55596.

The product of its digits is 3674160, while the sum is 56.

The square root of 641969579 is about 25337.1186009775. The cubic root of 641969579 is about 862.6569976476.

The spelling of 641969579 in words is "six hundred forty-one million, nine hundred sixty-nine thousand, five hundred seventy-nine".