77969 has 2 divisors, whose sum is σ = 77970. Its totient is φ = 77968.

The previous prime is 77951. The next prime is 77977. The reversal of 77969 is 96977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70225 + 7744 = 265^2 + 88^2 .

It is a cyclic number.

It is not a de Polignac number, because 77969 - 2⁸ = 77713 is a prime.

It is a super-2 number, since 2×77969² = 12158329922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38984 + 38985.

It is an arithmetic number, because the mean of its divisors is an integer number (38985).

2⁷⁷⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

77969 is a deficient number, since it is larger than the sum of its proper divisors (1).

77969 is an equidigital number, since it uses as much as digits as its factorization.

77969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23814, while the sum is 38.

The square root of 77969 is about 279.2292964572. The cubic root of 77969 is about 42.7209257071.

It can be divided in two parts, 779 and 69, that added together give a palindrome (848).

The spelling of 77969 in words is "seventy-seven thousand, nine hundred sixty-nine".