15505855 has 4 divisors (see below), whose sum is σ = 18607032. Its totient is φ = 12404680.

The previous prime is 15505829. The next prime is 15505871. The reversal of 15505855 is 55850551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 15505855 - 2¹³ = 15497663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15505855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1550581 + ... + 1550590.

It is an arithmetic number, because the mean of its divisors is an integer number (4651758).

Almost surely, 2^15505855 is an apocalyptic number.

15505855 is a deficient number, since it is larger than the sum of its proper divisors (3101177).

15505855 is an equidigital number, since it uses as much as digits as its factorization.

15505855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101176.

The product of its (nonzero) digits is 25000, while the sum is 34.

The square root of 15505855 is about 3937.7474525419. The cubic root of 15505855 is about 249.3629379869.

The spelling of 15505855 in words is "fifteen million, five hundred five thousand, eight hundred fifty-five".