12551887 has 4 divisors (see below), whose sum is σ = 12627216. Its totient is φ = 12476560.

The previous prime is 12551881. The next prime is 12551893. The reversal of 12551887 is 78815521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78815521 = 1109 ⋅71069.

It is an interprime number because it is at equal distance from previous prime (12551881) and next prime (12551893).

It is a cyclic number.

It is not a de Polignac number, because 12551887 - 2¹⁹ = 12027599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12551881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37414 + ... + 37747.

It is an arithmetic number, because the mean of its divisors is an integer number (3156804).

Almost surely, 2^12551887 is an apocalyptic number.

12551887 is a deficient number, since it is larger than the sum of its proper divisors (75329).

12551887 is an equidigital number, since it uses as much as digits as its factorization.

12551887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75328.

The product of its digits is 22400, while the sum is 37.

The square root of 12551887 is about 3542.8642367441. The cubic root of 12551887 is about 232.4001158802.

The spelling of 12551887 in words is "twelve million, five hundred fifty-one thousand, eight hundred eighty-seven".