641084691 has 16 divisors (see below), whose sum is σ = 921745664. Its totient is φ = 393993504.

The previous prime is 641084687. The next prime is 641084693. The reversal of 641084691 is 196480146.

It is not a de Polignac number, because 641084691 - 2² = 641084687 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641084693) 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, 20250 + ... + 41136.

It is an arithmetic number, because the mean of its divisors is an integer number (57609104).

Almost surely, 2^641084691 is an apocalyptic number.

641084691 is a deficient number, since it is larger than the sum of its proper divisors (280660973).

641084691 is a wasteful number, since it uses less digits than its factorization.

641084691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21690.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 641084691 is about 25319.6502937936. The cubic root of 641084691 is about 862.2604545433.

The spelling of 641084691 in words is "six hundred forty-one million, eighty-four thousand, six hundred ninety-one".