641912969 has 4 divisors (see below), whose sum is σ = 646813200. Its totient is φ = 637012740.

The previous prime is 641912927. The next prime is 641912983. The reversal of 641912969 is 969219146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 641912969 - 2¹⁶ = 641847433 is a prime.

It is a super-2 number, since 2×641912969² = 824104519540789922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641912989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2449919 + ... + 2450180.

It is an arithmetic number, because the mean of its divisors is an integer number (161703300).

Almost surely, 2^641912969 is an apocalyptic number.

It is an amenable number.

641912969 is a deficient number, since it is larger than the sum of its proper divisors (4900231).

641912969 is a wasteful number, since it uses less digits than its factorization.

641912969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4900230.

The product of its digits is 209952, while the sum is 47.

The square root of 641912969 is about 25336.0014406378. The cubic root of 641912969 is about 862.6316400347.

The spelling of 641912969 in words is "six hundred forty-one million, nine hundred twelve thousand, nine hundred sixty-nine".