15551099 has 2 divisors, whose sum is σ = 15551100. Its totient is φ = 15551098.

The previous prime is 15551087. The next prime is 15551111. The reversal of 15551099 is 99015551.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (15551087) and next prime (15551111).

It is a cyclic number.

It is not a de Polignac number, because 15551099 - 2⁴ = 15551083 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (15551009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7775549 + 7775550.

It is an arithmetic number, because the mean of its divisors is an integer number (7775550).

Almost surely, 2^15551099 is an apocalyptic number.

15551099 is a deficient number, since it is larger than the sum of its proper divisors (1).

15551099 is an equidigital number, since it uses as much as digits as its factorization.

15551099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10125, while the sum is 35.

The square root of 15551099 is about 3943.4881767288. The cubic root of 15551099 is about 249.6052383143.

The spelling of 15551099 in words is "fifteen million, five hundred fifty-one thousand, ninety-nine".