15551149 has 2 divisors, whose sum is σ = 15551150. Its totient is φ = 15551148.

The previous prime is 15551147. The next prime is 15551153. The reversal of 15551149 is 94115551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13468900 + 2082249 = 3670^2 + 1443^2 .

It is an emirp because it is prime and its reverse (94115551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15551149 - 2¹ = 15551147 is a prime.

Together with 15551147, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 15551149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15551147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7775574 + 7775575.

It is an arithmetic number, because the mean of its divisors is an integer number (7775575).

Almost surely, 2^15551149 is an apocalyptic number.

It is an amenable number.

15551149 is a deficient number, since it is larger than the sum of its proper divisors (1).

15551149 is an equidigital number, since it uses as much as digits as its factorization.

15551149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4500, while the sum is 31.

The square root of 15551149 is about 3943.4945162888. The cubic root of 15551149 is about 249.6055058248.

It can be divided in two parts, 1555 and 1149, that added together give a square (2704 = 52²).

The spelling of 15551149 in words is "fifteen million, five hundred fifty-one thousand, one hundred forty-nine".