77311397 has 2 divisors, whose sum is σ = 77311398. Its totient is φ = 77311396.

The previous prime is 77311357. The next prime is 77311457. The reversal of 77311397 is 79311377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43217476 + 34093921 = 6574^2 + 5839^2 .

It is a cyclic number.

It is not a de Polignac number, because 77311397 - 2¹⁴ = 77295013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77311397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77311327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38655698 + 38655699.

It is an arithmetic number, because the mean of its divisors is an integer number (38655699).

Almost surely, 2^77311397 is an apocalyptic number.

It is an amenable number.

77311397 is a deficient number, since it is larger than the sum of its proper divisors (1).

77311397 is an equidigital number, since it uses as much as digits as its factorization.

77311397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27783, while the sum is 38.

The square root of 77311397 is about 8792.6899752010. The cubic root of 77311397 is about 426.0048141726.

The spelling of 77311397 in words is "seventy-seven million, three hundred eleven thousand, three hundred ninety-seven".