15551171 has 2 divisors, whose sum is σ = 15551172. Its totient is φ = 15551170.

The previous prime is 15551153. The next prime is 15551183. The reversal of 15551171 is 17115551.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15551171 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15551171.

It is not a weakly prime, because it can be changed into another prime (15551111) 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, 7775585 + 7775586.

It is an arithmetic number, because the mean of its divisors is an integer number (7775586).

Almost surely, 2^15551171 is an apocalyptic number.

15551171 is a deficient number, since it is larger than the sum of its proper divisors (1).

15551171 is an equidigital number, since it uses as much as digits as its factorization.

15551171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 875, while the sum is 26.

The square root of 15551171 is about 3943.4973056920. The cubic root of 15551171 is about 249.6056235293.

The spelling of 15551171 in words is "fifteen million, five hundred fifty-one thousand, one hundred seventy-one".