1252542521 has 4 divisors (see below), whose sum is σ = 1264703232. Its totient is φ = 1240381812.

The previous prime is 1252542517. The next prime is 1252542539. The reversal of 1252542521 is 1252452521.

It is a happy number.

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 1252542521 - 2² = 1252542517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252542121) 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, 6080201 + ... + 6080406.

It is an arithmetic number, because the mean of its divisors is an integer number (316175808).

Almost surely, 2^1252542521 is an apocalyptic number.

It is an amenable number.

1252542521 is a deficient number, since it is larger than the sum of its proper divisors (12160711).

1252542521 is a wasteful number, since it uses less digits than its factorization.

1252542521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12160710.

The product of its digits is 8000, while the sum is 29.

The square root of 1252542521 is about 35391.2774705859. The cubic root of 1252542521 is about 1077.9472097793.

Subtracting from 1252542521 its reverse (1252452521), we obtain a square (90000 = 300²).

The spelling of 1252542521 in words is "one billion, two hundred fifty-two million, five hundred forty-two thousand, five hundred twenty-one".