641232769 has 2 divisors, whose sum is σ = 641232770. Its totient is φ = 641232768.

The previous prime is 641232763. The next prime is 641232773. The reversal of 641232769 is 967232146.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 604569744 + 36663025 = 24588^2 + 6055^2 .

It is a cyclic number.

It is not a de Polignac number, because 641232769 - 2¹⁷ = 641101697 is a prime.

It is a super-2 number, since 2×641232769² = 822358928078814722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (641232763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320616384 + 320616385.

It is an arithmetic number, because the mean of its divisors is an integer number (320616385).

Almost surely, 2^641232769 is an apocalyptic number.

It is an amenable number.

641232769 is a deficient number, since it is larger than the sum of its proper divisors (1).

641232769 is an equidigital number, since it uses as much as digits as its factorization.

641232769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 40.

The square root of 641232769 is about 25322.5742964652. The cubic root of 641232769 is about 862.3268378548.

The spelling of 641232769 in words is "six hundred forty-one million, two hundred thirty-two thousand, seven hundred sixty-nine".