124842795521 has 2 divisors, whose sum is σ = 124842795522. Its totient is φ = 124842795520.

The previous prime is 124842795377. The next prime is 124842795563. The reversal of 124842795521 is 125597248421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111131556496 + 13711239025 = 333364^2 + 117095^2 .

It is an emirp because it is prime and its reverse (125597248421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124842795521 is a prime.

It is a super-2 number, since 2×124842795521² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 124842795521.

It is not a weakly prime, because it can be changed into another prime (124842785521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62421397760 + 62421397761.

It is an arithmetic number, because the mean of its divisors is an integer number (62421397761).

Almost surely, 2^124842795521 is an apocalyptic number.

It is an amenable number.

124842795521 is a deficient number, since it is larger than the sum of its proper divisors (1).

124842795521 is an equidigital number, since it uses as much as digits as its factorization.

124842795521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 50.

The spelling of 124842795521 in words is "one hundred twenty-four billion, eight hundred forty-two million, seven hundred ninety-five thousand, five hundred twenty-one".