77541979 has 2 divisors, whose sum is σ = 77541980. Its totient is φ = 77541978.

The previous prime is 77541953. The next prime is 77542007. The reversal of 77541979 is 97914577.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77541979 - 2⁹ = 77541467 is a prime.

It is not a weakly prime, because it can be changed into another prime (77541929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38770989 + 38770990.

It is an arithmetic number, because the mean of its divisors is an integer number (38770990).

Almost surely, 2^77541979 is an apocalyptic number.

77541979 is a deficient number, since it is larger than the sum of its proper divisors (1).

77541979 is an equidigital number, since it uses as much as digits as its factorization.

77541979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 555660, while the sum is 49.

The square root of 77541979 is about 8805.7923550354. The cubic root of 77541979 is about 426.4279149961.

The spelling of 77541979 in words is "seventy-seven million, five hundred forty-one thousand, nine hundred seventy-nine".