126915779 has 2 divisors, whose sum is σ = 126915780. Its totient is φ = 126915778.

The previous prime is 126915773. The next prime is 126915781. The reversal of 126915779 is 977519621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126915779 is a prime.

It is a super-2 number, since 2×126915779² = 32215229918353682, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 126915781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126915773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63457889 + 63457890.

It is an arithmetic number, because the mean of its divisors is an integer number (63457890).

Almost surely, 2^126915779 is an apocalyptic number.

126915779 is a deficient number, since it is larger than the sum of its proper divisors (1).

126915779 is an equidigital number, since it uses as much as digits as its factorization.

126915779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 238140, while the sum is 47.

The square root of 126915779 is about 11265.6903472446. The cubic root of 126915779 is about 502.5414323567.

The spelling of 126915779 in words is "one hundred twenty-six million, nine hundred fifteen thousand, seven hundred seventy-nine".