641627381 has 8 divisors (see below), whose sum is σ = 668939040. Its totient is φ = 614878992.

The previous prime is 641627377. The next prime is 641627387. The reversal of 641627381 is 183726146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641627381 - 2² = 641627377 is a prime.

It is a super-2 number, since 2×641627381² = 823371392097838322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641627387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138491 + ... + 143048.

It is an arithmetic number, because the mean of its divisors is an integer number (83617380).

Almost surely, 2^641627381 is an apocalyptic number.

It is an amenable number.

641627381 is a deficient number, since it is larger than the sum of its proper divisors (27311659).

641627381 is a wasteful number, since it uses less digits than its factorization.

641627381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281635.

The product of its digits is 48384, while the sum is 38.

The square root of 641627381 is about 25330.3648019526. The cubic root of 641627381 is about 862.5036923737.

The spelling of 641627381 in words is "six hundred forty-one million, six hundred twenty-seven thousand, three hundred eighty-one".