123775979 has 2 divisors, whose sum is σ = 123775980. Its totient is φ = 123775978.

The previous prime is 123775909. The next prime is 123775987. The reversal of 123775979 is 979577321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123775979 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (123775909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61887989 + 61887990.

It is an arithmetic number, because the mean of its divisors is an integer number (61887990).

Almost surely, 2^123775979 is an apocalyptic number.

123775979 is a deficient number, since it is larger than the sum of its proper divisors (1).

123775979 is an equidigital number, since it uses as much as digits as its factorization.

123775979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 833490, while the sum is 50.

The square root of 123775979 is about 11125.4653385825. The cubic root of 123775979 is about 498.3626157991.

The spelling of 123775979 in words is "one hundred twenty-three million, seven hundred seventy-five thousand, nine hundred seventy-nine".