12551881 has 2 divisors, whose sum is σ = 12551882. Its totient is φ = 12551880.

The previous prime is 12551873. The next prime is 12551893. The reversal of 12551881 is 18815521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8179600 + 4372281 = 2860^2 + 2091^2 .

It is a cyclic number.

It is not a de Polignac number, because 12551881 - 2³ = 12551873 is a prime.

It is a super-2 number, since 2×12551881² = 315099433276322, which contains 22 as substring.

It is a Chen prime.

It is equal to p₈₂₁₈₆₆ and since 12551881 and 821866 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12551681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6275940 + 6275941.

It is an arithmetic number, because the mean of its divisors is an integer number (6275941).

Almost surely, 2^12551881 is an apocalyptic number.

It is an amenable number.

12551881 is a deficient number, since it is larger than the sum of its proper divisors (1).

12551881 is an equidigital number, since it uses as much as digits as its factorization.

12551881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3200, while the sum is 31.

The square root of 12551881 is about 3542.8633899715. The cubic root of 12551881 is about 232.4000788499.

It can be divided in two parts, 1255 and 1881, that added together give a square (3136 = 56²).

The spelling of 12551881 in words is "twelve million, five hundred fifty-one thousand, eight hundred eighty-one".