641265511 has 2 divisors, whose sum is σ = 641265512. Its totient is φ = 641265510.

The previous prime is 641265491. The next prime is 641265557. The reversal of 641265511 is 115562146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641265511 - 2⁵ = 641265479 is a prime.

It is a super-2 number, since 2×641265511² = 822442911196182242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641265011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320632755 + 320632756.

It is an arithmetic number, because the mean of its divisors is an integer number (320632756).

Almost surely, 2^641265511 is an apocalyptic number.

641265511 is a deficient number, since it is larger than the sum of its proper divisors (1).

641265511 is an equidigital number, since it uses as much as digits as its factorization.

641265511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 641265511 is about 25323.2207864640. The cubic root of 641265511 is about 862.3415147013.

The spelling of 641265511 in words is "six hundred forty-one million, two hundred sixty-five thousand, five hundred eleven".