1252272409 has 4 divisors (see below), whose sum is σ = 1253135716. Its totient is φ = 1251409104.

The previous prime is 1252272407. The next prime is 1252272419. The reversal of 1252272409 is 9042722521.

It is a happy number.

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 1147312384 + 104960025 = 33872^2 + 10245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1252272409 - 2¹ = 1252272407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252272407) 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, 429474 + ... + 432379.

It is an arithmetic number, because the mean of its divisors is an integer number (313283929).

Almost surely, 2^1252272409 is an apocalyptic number.

It is an amenable number.

1252272409 is a deficient number, since it is larger than the sum of its proper divisors (863307).

1252272409 is an equidigital number, since it uses as much as digits as its factorization.

1252272409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863306.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1252272409 is about 35387.4611833062. The cubic root of 1252272409 is about 1077.8697174243.

The spelling of 1252272409 in words is "one billion, two hundred fifty-two million, two hundred seventy-two thousand, four hundred nine".