1252195581 has 16 divisors (see below), whose sum is σ = 2054885504. Its totient is φ = 660498624.

The previous prime is 1252195579. The next prime is 1252195613. The reversal of 1252195581 is 1855912521.

It is not a de Polignac number, because 1252195581 - 2¹ = 1252195579 is a prime.

It is a super-2 number, since 2×1252195581² = 3135987546151855122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252195531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2293126 + ... + 2293671.

It is an arithmetic number, because the mean of its divisors is an integer number (128430344).

Almost surely, 2^1252195581 is an apocalyptic number.

It is an amenable number.

1252195581 is a deficient number, since it is larger than the sum of its proper divisors (802689923).

1252195581 is a wasteful number, since it uses less digits than its factorization.

1252195581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4586820.

The product of its digits is 36000, while the sum is 39.

The square root of 1252195581 is about 35386.3756409158. The cubic root of 1252195581 is about 1077.8476742257.

The spelling of 1252195581 in words is "one billion, two hundred fifty-two million, one hundred ninety-five thousand, five hundred eighty-one".