15551287 has 2 divisors, whose sum is σ = 15551288. Its totient is φ = 15551286.

The previous prime is 15551269. The next prime is 15551293. The reversal of 15551287 is 78215551.

It is a strong prime.

It is an emirp because it is prime and its reverse (78215551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15551287 - 2²³ = 7162679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15551267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7775643 + 7775644.

It is an arithmetic number, because the mean of its divisors is an integer number (7775644).

Almost surely, 2^15551287 is an apocalyptic number.

15551287 is a deficient number, since it is larger than the sum of its proper divisors (1).

15551287 is an equidigital number, since it uses as much as digits as its factorization.

15551287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14000, while the sum is 34.

The square root of 15551287 is about 3943.5120134215. The cubic root of 15551287 is about 249.6062441509.

The spelling of 15551287 in words is "fifteen million, five hundred fifty-one thousand, two hundred eighty-seven".