1252551109 has 4 divisors (see below), whose sum is σ = 1326230604. Its totient is φ = 1178871616.

The previous prime is 1252551073. The next prime is 1252551149. The reversal of 1252551109 is 9011552521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9011552521 = 41341 ⋅217981.

It can be written as a sum of positive squares in 2 ways, for example, as 790172100 + 462379009 = 28110^2 + 21503^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252551109 - 2⁹ = 1252550597 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 (1252551149) 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, 36839722 + ... + 36839755.

It is an arithmetic number, because the mean of its divisors is an integer number (331557651).

Almost surely, 2^1252551109 is an apocalyptic number.

It is an amenable number.

1252551109 is a deficient number, since it is larger than the sum of its proper divisors (73679495).

1252551109 is an equidigital number, since it uses as much as digits as its factorization.

1252551109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73679494.

The product of its (nonzero) digits is 4500, while the sum is 31.

The square root of 1252551109 is about 35391.3987997084. The cubic root of 1252551109 is about 1077.9496734055.

The spelling of 1252551109 in words is "one billion, two hundred fifty-two million, five hundred fifty-one thousand, one hundred nine".