1252442521 has 8 divisors (see below), whose sum is σ = 1379829888. Its totient is φ = 1127310000.

The previous prime is 1252442509. The next prime is 1252442533.

It is a happy number.

1252442521 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (1252442509) and next prime (1252442533).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1252442521 - 2¹⁷ = 1252311449 is a prime.

It is a super-2 number, since 2×1252442521² = 3137224536817670882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1252442521.

It is not an unprimeable number, because it can be changed into a prime (1252446521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 562545 + ... + 564766.

It is an arithmetic number, because the mean of its divisors is an integer number (172478736).

Almost surely, 2^1252442521 is an apocalyptic number.

1252442521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1252442521 is a deficient number, since it is larger than the sum of its proper divisors (127387367).

1252442521 is a wasteful number, since it uses less digits than its factorization.

1252442521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127423.

The product of its digits is 6400, while the sum is 28.

The square root of 1252442521 is about 35389.8646649009. The cubic root of 1252442521 is about 1077.9185221066.

It can be divided in two parts, 125244 and 2521, that added together give a triangular number (127765 = T₅₀₅).

The spelling of 1252442521 in words is "one billion, two hundred fifty-two million, four hundred forty-two thousand, five hundred twenty-one".