15551155 has 4 divisors (see below), whose sum is σ = 18661392. Its totient is φ = 12440920.

The previous prime is 15551153. The next prime is 15551171. The reversal of 15551155 is 55115551.

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

It is not a de Polignac number, because 15551155 - 2¹ = 15551153 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15551153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1555111 + ... + 1555120.

It is an arithmetic number, because the mean of its divisors is an integer number (4665348).

Almost surely, 2^15551155 is an apocalyptic number.

15551155 is a deficient number, since it is larger than the sum of its proper divisors (3110237).

15551155 is an equidigital number, since it uses as much as digits as its factorization.

15551155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3110236.

The product of its digits is 3125, while the sum is 28.

The square root of 15551155 is about 3943.4952770353. The cubic root of 15551155 is about 249.6055379260.

The spelling of 15551155 in words is "fifteen million, five hundred fifty-one thousand, one hundred fifty-five".