641554172 has 12 divisors (see below), whose sum is σ = 1283108400. Its totient is φ = 274951776.

The previous prime is 641554169. The next prime is 641554189. The reversal of 641554172 is 271455146.

641554172 is an admirable number.

It is a super-2 number, since 2×641554172² = 823183511221211168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11456297 + ... + 11456352.

It is an arithmetic number, because the mean of its divisors is an integer number (106925700).

Almost surely, 2^641554172 is an apocalyptic number.

It is an amenable number.

641554172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

641554172 is a wasteful number, since it uses less digits than its factorization.

641554172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22912660 (or 22912658 counting only the distinct ones).

The product of its digits is 33600, while the sum is 35.

The square root of 641554172 is about 25328.9196769227. The cubic root of 641554172 is about 862.4708875422.

The spelling of 641554172 in words is "six hundred forty-one million, five hundred fifty-four thousand, one hundred seventy-two".