1252567561 has 4 divisors (see below), whose sum is σ = 1431505792. Its totient is φ = 1073629332.

The previous prime is 1252567553. The next prime is 1252567601. The reversal of 1252567561 is 1657652521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1252567561 - 2³ = 1252567553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252567501) 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, 89469105 + ... + 89469118.

It is an arithmetic number, because the mean of its divisors is an integer number (357876448).

Almost surely, 2^1252567561 is an apocalyptic number.

It is an amenable number.

1252567561 is a deficient number, since it is larger than the sum of its proper divisors (178938231).

1252567561 is an equidigital number, since it uses as much as digits as its factorization.

1252567561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178938230.

The product of its digits is 126000, while the sum is 40.

The square root of 1252567561 is about 35391.6312283003. The cubic root of 1252567561 is about 1077.9543929335.

The spelling of 1252567561 in words is "one billion, two hundred fifty-two million, five hundred sixty-seven thousand, five hundred sixty-one".