641522139 has 4 divisors (see below), whose sum is σ = 855362856. Its totient is φ = 427681424.

The previous prime is 641522111. The next prime is 641522159. The reversal of 641522139 is 931225146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641522139 - 2⁹ = 641521627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641522159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106920354 + ... + 106920359.

It is an arithmetic number, because the mean of its divisors is an integer number (213840714).

Almost surely, 2^641522139 is an apocalyptic number.

641522139 is a deficient number, since it is larger than the sum of its proper divisors (213840717).

641522139 is a wasteful number, since it uses less digits than its factorization.

641522139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213840716.

The product of its digits is 12960, while the sum is 33.

The square root of 641522139 is about 25328.2873285976. The cubic root of 641522139 is about 862.4565328231.

The spelling of 641522139 in words is "six hundred forty-one million, five hundred twenty-two thousand, one hundred thirty-nine".