641553147 has 12 divisors (see below), whose sum is σ = 931542144. Its totient is φ = 425461680.

The previous prime is 641553139. The next prime is 641553161. The reversal of 641553147 is 741355146.

641553147 is a `hidden beast` number, since 64 + 1 + 553 + 1 + 47 = 666.

It is not a de Polignac number, because 641553147 - 2³ = 641553139 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (641553047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184888 + ... + 188325.

It is an arithmetic number, because the mean of its divisors is an integer number (77628512).

Almost surely, 2^641553147 is an apocalyptic number.

641553147 is a deficient number, since it is larger than the sum of its proper divisors (289988997).

641553147 is a wasteful number, since it uses less digits than its factorization.

641553147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373410 (or 373407 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 641553147 is about 25328.8994431262. The cubic root of 641553147 is about 862.4704282237.

The spelling of 641553147 in words is "six hundred forty-one million, five hundred fifty-three thousand, one hundred forty-seven".