641161387 has 2 divisors, whose sum is σ = 641161388. Its totient is φ = 641161386.

The previous prime is 641161379. The next prime is 641161397. The reversal of 641161387 is 783161146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641161387 - 2³ = 641161379 is a prime.

It is a super-2 number, since 2×641161387² = 822175848359527538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641161337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320580693 + 320580694.

It is an arithmetic number, because the mean of its divisors is an integer number (320580694).

Almost surely, 2^641161387 is an apocalyptic number.

641161387 is a deficient number, since it is larger than the sum of its proper divisors (1).

641161387 is an equidigital number, since it uses as much as digits as its factorization.

641161387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 641161387 is about 25321.1648033814. The cubic root of 641161387 is about 862.2948386071.

The spelling of 641161387 in words is "six hundred forty-one million, one hundred sixty-one thousand, three hundred eighty-seven".