1252136521 has 2 divisors, whose sum is σ = 1252136522. Its totient is φ = 1252136520.

The previous prime is 1252136507. The next prime is 1252136533. The reversal of 1252136521 is 1256312521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1234538496 + 17598025 = 35136^2 + 4195^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252136521 - 2⁵ = 1252136489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1252136521.

It is not a weakly prime, because it can be changed into another prime (1252136591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626068260 + 626068261.

It is an arithmetic number, because the mean of its divisors is an integer number (626068261).

Almost surely, 2^1252136521 is an apocalyptic number.

It is an amenable number.

1252136521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252136521 is an equidigital number, since it uses as much as digits as its factorization.

1252136521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 28.

The square root of 1252136521 is about 35385.5411291109. The cubic root of 1252136521 is about 1077.8307283413.

The spelling of 1252136521 in words is "one billion, two hundred fifty-two million, one hundred thirty-six thousand, five hundred twenty-one".