1252866785 has 4 divisors (see below), whose sum is σ = 1503440148. Its totient is φ = 1002293424.

The previous prime is 1252866779. The next prime is 1252866809. The reversal of 1252866785 is 5876682521.

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 684711889 + 568154896 = 26167^2 + 23836^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252866785 - 2⁸ = 1252866529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125286674 + ... + 125286683.

It is an arithmetic number, because the mean of its divisors is an integer number (375860037).

Almost surely, 2^1252866785 is an apocalyptic number.

It is an amenable number.

1252866785 is a deficient number, since it is larger than the sum of its proper divisors (250573363).

1252866785 is an equidigital number, since it uses as much as digits as its factorization.

1252866785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250573362.

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

The square root of 1252866785 is about 35395.8583029145. The cubic root of 1252866785 is about 1078.0402230727.

The spelling of 1252866785 in words is "one billion, two hundred fifty-two million, eight hundred sixty-six thousand, seven hundred eighty-five".