15550 has 12 divisors (see below), whose sum is σ = 29016. Its totient is φ = 6200.

The previous prime is 15541. The next prime is 15551. The reversal of 15550 is 5551.

It is a nialpdrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15551) by changing a digit.

15550 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106 + ... + 205.

It is an arithmetic number, because the mean of its divisors is an integer number (2418).

2¹⁵⁵⁵⁰ is an apocalyptic number.

15550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15550 is a deficient number, since it is larger than the sum of its proper divisors (13466).

15550 is a wasteful number, since it uses less digits than its factorization.

15550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 125, while the sum is 16.

The square root of 15550 is about 124.6996391334. The cubic root of 15550 is about 24.9599358288.

Subtracting from 15550 its reverse (5551), we obtain a palindrome (9999).

It can be divided in two parts, 155 and 50, that multiplied together give a triangular number (7750 = T₁₂₄).

The spelling of 15550 in words is "fifteen thousand, five hundred fifty".