1252315565 has 4 divisors (see below), whose sum is σ = 1502778684. Its totient is φ = 1001852448.

The previous prime is 1252315549. The next prime is 1252315567. The reversal of 1252315565 is 5655132521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 657101956 + 595213609 = 25634^2 + 24397^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252315565 - 2⁴ = 1252315549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252315567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125231552 + ... + 125231561.

It is an arithmetic number, because the mean of its divisors is an integer number (375694671).

Almost surely, 2^1252315565 is an apocalyptic number.

It is an amenable number.

1252315565 is a deficient number, since it is larger than the sum of its proper divisors (250463119).

1252315565 is an equidigital number, since it uses as much as digits as its factorization.

1252315565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250463118.

The product of its digits is 45000, while the sum is 35.

The square root of 1252315565 is about 35388.0709420562. The cubic root of 1252315565 is about 1077.8820991848.

The spelling of 1252315565 in words is "one billion, two hundred fifty-two million, three hundred fifteen thousand, five hundred sixty-five".