77137979 has 2 divisors, whose sum is σ = 77137980. Its totient is φ = 77137978.

The previous prime is 77137961. The next prime is 77138003. The reversal of 77137979 is 97973177.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77137979 - 2¹² = 77133883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77137939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38568989 + 38568990.

It is an arithmetic number, because the mean of its divisors is an integer number (38568990).

Almost surely, 2^77137979 is an apocalyptic number.

77137979 is a deficient number, since it is larger than the sum of its proper divisors (1).

77137979 is an equidigital number, since it uses as much as digits as its factorization.

77137979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583443, while the sum is 50.

The square root of 77137979 is about 8782.8229516483. The cubic root of 77137979 is about 425.6860504341.

The spelling of 77137979 in words is "seventy-seven million, one hundred thirty-seven thousand, nine hundred seventy-nine".