77261369 has 2 divisors, whose sum is σ = 77261370. Its totient is φ = 77261368.

The previous prime is 77261363. The next prime is 77261389. The reversal of 77261369 is 96316277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46403344 + 30858025 = 6812^2 + 5555^2 .

It is an emirp because it is prime and its reverse (96316277) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77261369 is a prime.

It is a super-2 number, since 2×77261369² = 11938638279508322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77261363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38630684 + 38630685.

It is an arithmetic number, because the mean of its divisors is an integer number (38630685).

Almost surely, 2^77261369 is an apocalyptic number.

It is an amenable number.

77261369 is a deficient number, since it is larger than the sum of its proper divisors (1).

77261369 is an equidigital number, since it uses as much as digits as its factorization.

77261369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 41.

The square root of 77261369 is about 8789.8446516420. The cubic root of 77261369 is about 425.9129054833.

The spelling of 77261369 in words is "seventy-seven million, two hundred sixty-one thousand, three hundred sixty-nine".