1252242491 has 18 divisors (see below), whose sum is σ = 1357793460. Its totient is φ = 1154329920.

The previous prime is 1252242463. The next prime is 1252242503. The reversal of 1252242491 is 1942422521.

It is not a de Polignac number, because 1252242491 - 2¹⁰ = 1252241467 is a prime.

It is a super-2 number, since 2×1252242491² = 3136222512531770162, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252242191) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4620686 + ... + 4620956.

It is an arithmetic number, because the mean of its divisors is an integer number (75432970).

Almost surely, 2^1252242491 is an apocalyptic number.

1252242491 is a deficient number, since it is larger than the sum of its proper divisors (105550969).

1252242491 is an frugal number, since it uses more digits than its factorization.

1252242491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 347 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 1252242491 is about 35387.0384604307. The cubic root of 1252242491 is about 1077.8611335723.

The spelling of 1252242491 in words is "one billion, two hundred fifty-two million, two hundred forty-two thousand, four hundred ninety-one".