13121887 has 2 divisors, whose sum is σ = 13121888. Its totient is φ = 13121886.

The previous prime is 13121881. The next prime is 13121921. The reversal of 13121887 is 78812131.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (78812131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13121887 - 2²³ = 4733279 is a prime.

It is a super-3 number, since 3×13121887³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13121881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6560943 + 6560944.

It is an arithmetic number, because the mean of its divisors is an integer number (6560944).

Almost surely, 2^13121887 is an apocalyptic number.

13121887 is a deficient number, since it is larger than the sum of its proper divisors (1).

13121887 is an equidigital number, since it uses as much as digits as its factorization.

13121887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 31.

The square root of 13121887 is about 3622.4145262518. The cubic root of 13121887 is about 235.8660484220.

The spelling of 13121887 in words is "thirteen million, one hundred twenty-one thousand, eight hundred eighty-seven".