77339261 has 2 divisors, whose sum is σ = 77339262. Its totient is φ = 77339260.

The previous prime is 77339257. The next prime is 77339263. The reversal of 77339261 is 16293377.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61387225 + 15952036 = 7835^2 + 3994^2 .

It is a cyclic number.

It is not a de Polignac number, because 77339261 - 2² = 77339257 is a prime.

It is a super-2 number, since 2×77339261² = 11962722584052242, which contains 22 as substring.

Together with 77339263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77339263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38669630 + 38669631.

It is an arithmetic number, because the mean of its divisors is an integer number (38669631).

Almost surely, 2^77339261 is an apocalyptic number.

It is an amenable number.

77339261 is a deficient number, since it is larger than the sum of its proper divisors (1).

77339261 is an equidigital number, since it uses as much as digits as its factorization.

77339261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 38.

The square root of 77339261 is about 8794.2743304948. The cubic root of 77339261 is about 426.0559871899.

The spelling of 77339261 in words is "seventy-seven million, three hundred thirty-nine thousand, two hundred sixty-one".