1253115123521 has 2 divisors, whose sum is σ = 1253115123522. Its totient is φ = 1253115123520.

The previous prime is 1253115123517. The next prime is 1253115123523. The reversal of 1253115123521 is 1253215113521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1251346500496 + 1768623025 = 1118636^2 + 42055^2 .

It is a cyclic number.

It is not a de Polignac number, because 1253115123521 - 2² = 1253115123517 is a prime.

Together with 1253115123523, 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 (1253115123523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626557561760 + 626557561761.

It is an arithmetic number, because the mean of its divisors is an integer number (626557561761).

Almost surely, 2^{1253115123521} is an apocalyptic number.

It is an amenable number.

1253115123521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253115123521 is an equidigital number, since it uses as much as digits as its factorization.

1253115123521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 32.

The spelling of 1253115123521 in words is "one trillion, two hundred fifty-three billion, one hundred fifteen million, one hundred twenty-three thousand, five hundred twenty-one".