641327977 has 2 divisors, whose sum is σ = 641327978. Its totient is φ = 641327976.

The previous prime is 641327963. The next prime is 641328001. The reversal of 641327977 is 779723146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 520569856 + 120758121 = 22816^2 + 10989^2 .

It is a cyclic number.

It is not a de Polignac number, because 641327977 - 2¹⁵ = 641295209 is a prime.

It is a super-2 number, since 2×641327977² = 822603148165825058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641327917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320663988 + 320663989.

It is an arithmetic number, because the mean of its divisors is an integer number (320663989).

Almost surely, 2^641327977 is an apocalyptic number.

It is an amenable number.

641327977 is a deficient number, since it is larger than the sum of its proper divisors (1).

641327977 is an equidigital number, since it uses as much as digits as its factorization.

641327977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 46.

The square root of 641327977 is about 25324.4541303460. The cubic root of 641327977 is about 862.3695141675.

The spelling of 641327977 in words is "six hundred forty-one million, three hundred twenty-seven thousand, nine hundred seventy-seven".