16252581 has 24 divisors (see below), whose sum is σ = 23469600. Its totient is φ = 9997344.

The previous prime is 16252573. The next prime is 16252597. The reversal of 16252581 is 18525261.

It is not a de Polignac number, because 16252581 - 2³ = 16252573 is a prime.

It is a super-2 number, since 2×16252581² = 528292778323122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16252531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46395 + ... + 46743.

It is an arithmetic number, because the mean of its divisors is an integer number (977900).

Almost surely, 2^16252581 is an apocalyptic number.

It is an amenable number.

16252581 is a deficient number, since it is larger than the sum of its proper divisors (7217019).

16252581 is a wasteful number, since it uses less digits than its factorization.

16252581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 414 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The square root of 16252581 is about 4031.4489950885. The cubic root of 16252581 is about 253.3032603191.

The spelling of 16252581 in words is "sixteen million, two hundred fifty-two thousand, five hundred eighty-one".