769821961 has 2 divisors, whose sum is σ = 769821962. Its totient is φ = 769821960.

The previous prime is 769821919. The next prime is 769821967. The reversal of 769821961 is 169128967.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 629257225 + 140564736 = 25085^2 + 11856^2 .

It is a cyclic number.

It is not a de Polignac number, because 769821961 - 2²¹ = 767724809 is a prime.

It is not a weakly prime, because it can be changed into another prime (769821967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384910980 + 384910981.

It is an arithmetic number, because the mean of its divisors is an integer number (384910981).

Almost surely, 2^769821961 is an apocalyptic number.

It is an amenable number.

769821961 is a deficient number, since it is larger than the sum of its proper divisors (1).

769821961 is an equidigital number, since it uses as much as digits as its factorization.

769821961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 769821961 is about 27745.6656254630. The cubic root of 769821961 is about 916.4949973769.

The spelling of 769821961 in words is "seven hundred sixty-nine million, eight hundred twenty-one thousand, nine hundred sixty-one".