641013491 has 4 divisors (see below), whose sum is σ = 644555184. Its totient is φ = 637471800.

The previous prime is 641013481. The next prime is 641013521. The reversal of 641013491 is 194310146.

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 641013491 - 2¹⁰ = 641012467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641013481) 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, 1770575 + ... + 1770936.

It is an arithmetic number, because the mean of its divisors is an integer number (161138796).

Almost surely, 2^641013491 is an apocalyptic number.

641013491 is a deficient number, since it is larger than the sum of its proper divisors (3541693).

641013491 is a wasteful number, since it uses less digits than its factorization.

641013491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3541692.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 641013491 is about 25318.2442321738. The cubic root of 641013491 is about 862.2285319709.

The spelling of 641013491 in words is "six hundred forty-one million, thirteen thousand, four hundred ninety-one".