12551538 has 24 divisors (see below), whose sum is σ = 25675632. Its totient is φ = 4090504.

The previous prime is 12551531. The next prime is 12551549. The reversal of 12551538 is 83515521.

It is a super-2 number, since 2×12551538² = 315082212330888, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12551531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12781 + ... + 13727.

It is an arithmetic number, because the mean of its divisors is an integer number (1069818).

Almost surely, 2^12551538 is an apocalyptic number.

12551538 is an abundant number, since it is smaller than the sum of its proper divisors (13124094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12551538 is an equidigital number, since it uses as much as digits as its factorization.

12551538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046 (or 999 counting only the distinct ones).

The product of its digits is 6000, while the sum is 30.

The square root of 12551538 is about 3542.8149824680. The cubic root of 12551538 is about 232.3979619307.

The spelling of 12551538 in words is "twelve million, five hundred fifty-one thousand, five hundred thirty-eight".