124621521779 has 2 divisors, whose sum is σ = 124621521780. Its totient is φ = 124621521778.

The previous prime is 124621521643. The next prime is 124621521781. The reversal of 124621521779 is 977125126421.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124621521779 is a prime.

It is a Sophie Germain prime.

Together with 124621521781, 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 (124621523779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62310760889 + 62310760890.

It is an arithmetic number, because the mean of its divisors is an integer number (62310760890).

Almost surely, 2^124621521779 is an apocalyptic number.

124621521779 is a deficient number, since it is larger than the sum of its proper divisors (1).

124621521779 is an equidigital number, since it uses as much as digits as its factorization.

124621521779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 47.

The spelling of 124621521779 in words is "one hundred twenty-four billion, six hundred twenty-one million, five hundred twenty-one thousand, seven hundred seventy-nine".