15881113 has 2 divisors, whose sum is σ = 15881114. Its totient is φ = 15881112.

The previous prime is 15881101. The next prime is 15881119. The reversal of 15881113 is 31118851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15776784 + 104329 = 3972^2 + 323^2 .

It is an emirp because it is prime and its reverse (31118851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15881113 - 2⁵ = 15881081 is a prime.

It is not a weakly prime, because it can be changed into another prime (15881119) 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, 7940556 + 7940557.

It is an arithmetic number, because the mean of its divisors is an integer number (7940557).

Almost surely, 2^15881113 is an apocalyptic number.

It is an amenable number.

15881113 is a deficient number, since it is larger than the sum of its proper divisors (1).

15881113 is an equidigital number, since it uses as much as digits as its factorization.

15881113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 28.

The square root of 15881113 is about 3985.1114162593. Note that the first 3 decimals coincide. The cubic root of 15881113 is about 251.3585401026.

Adding to 15881113 its reverse (31118851), we get a palindrome (46999964).

It can be divided in two parts, 1588 and 1113, that added together give a triangular number (2701 = T₇₃).

The spelling of 15881113 in words is "fifteen million, eight hundred eighty-one thousand, one hundred thirteen".