641916 has 36 divisors (see below), whose sum is σ = 1771224. Its totient is φ = 194400.

The previous prime is 641909. The next prime is 641923. The reversal of 641916 is 619146.

641916 is a `hidden beast` number, since 641 + 9 + 16 = 666.

641916 is nontrivially palindromic in base 5.

It is an interprime number because it is at equal distance from previous prime (641909) and next prime (641923).

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 641916.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 415 + ... + 1206.

2⁶⁴¹⁹¹⁶ is an apocalyptic number.

641916 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

641916 is an abundant number, since it is smaller than the sum of its proper divisors (1129308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641916 is a wasteful number, since it uses less digits than its factorization.

641916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642 (or 1637 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 641916 is about 801.1966050852. The cubic root of 641916 is about 86.2632997764.

The spelling of 641916 in words is "six hundred forty-one thousand, nine hundred sixteen".