55001155 has 12 divisors (see below), whose sum is σ = 72547776. Its totient is φ = 40000400.

The previous prime is 55001147. The next prime is 55001173. The reversal of 55001155 is 55110055.

It is not a de Polignac number, because 55001155 - 2³ = 55001147 is a prime.

It is a Duffinian number.

55001155 is a modest number, since divided by 1155 gives 55 as remainder.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44851 + ... + 46060.

It is an arithmetic number, because the mean of its divisors is an integer number (6045648).

Almost surely, 2^55001155 is an apocalyptic number.

55001155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55001155 is a deficient number, since it is larger than the sum of its proper divisors (17546621).

55001155 is a wasteful number, since it uses less digits than its factorization.

55001155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90938 (or 90927 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 22.

The square root of 55001155 is about 7416.2763567710. The cubic root of 55001155 is about 380.2979081242.

Subtracting 55001155 from its reverse (55110055), we obtain a square (108900 = 330²).

The spelling of 55001155 in words is "fifty-five million, one thousand, one hundred fifty-five".