779796421 has 2 divisors, whose sum is σ = 779796422. Its totient is φ = 779796420.

The previous prime is 779796397. The next prime is 779796431. The reversal of 779796421 is 124697977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 768065796 + 11730625 = 27714^2 + 3425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-779796421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (779796431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389898210 + 389898211.

It is an arithmetic number, because the mean of its divisors is an integer number (389898211).

Almost surely, 2^779796421 is an apocalyptic number.

It is an amenable number.

779796421 is a deficient number, since it is larger than the sum of its proper divisors (1).

779796421 is an equidigital number, since it uses as much as digits as its factorization.

779796421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 52.

The square root of 779796421 is about 27924.8352009461. The cubic root of 779796421 is about 920.4363167491.

The spelling of 779796421 in words is "seven hundred seventy-nine million, seven hundred ninety-six thousand, four hundred twenty-one".