641390499 has 12 divisors (see below), whose sum is σ = 939502512. Its totient is φ = 421570800.

The previous prime is 641390441. The next prime is 641390509. The reversal of 641390499 is 994093146.

641390499 is a `hidden beast` number, since 64 + 13 + 90 + 499 = 666.

It is not a de Polignac number, because 641390499 - 2⁷ = 641390371 is a prime.

It is a super-2 number, since 2×641390499² = 822763544414938002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641390699) 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 11 ways as a sum of consecutive naturals, for example, 501232 + ... + 502509.

It is an arithmetic number, because the mean of its divisors is an integer number (78291876).

Almost surely, 2^641390499 is an apocalyptic number.

641390499 is a deficient number, since it is larger than the sum of its proper divisors (298112013).

641390499 is a wasteful number, since it uses less digits than its factorization.

641390499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003818 (or 1003815 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 641390499 is about 25325.6885197619. The cubic root of 641390499 is about 862.3975369144.

The spelling of 641390499 in words is "six hundred forty-one million, three hundred ninety thousand, four hundred ninety-nine".