55215105 has 16 divisors (see below), whose sum is σ = 96375744. Its totient is φ = 26770880.

The previous prime is 55215089. The next prime is 55215119. The reversal of 55215105 is 50151255.

It is not a de Polignac number, because 55215105 - 2⁴ = 55215089 is a prime.

It is a super-2 number, since 2×55215105² = 6097415640322050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167154 + ... + 167483.

It is an arithmetic number, because the mean of its divisors is an integer number (6023484).

Almost surely, 2^55215105 is an apocalyptic number.

55215105 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55215105 is a deficient number, since it is larger than the sum of its proper divisors (41160639).

55215105 is a wasteful number, since it uses less digits than its factorization.

55215105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334656.

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 55215105 is about 7430.6867111997. The cubic root of 55215105 is about 380.7903793831.

The spelling of 55215105 in words is "fifty-five million, two hundred fifteen thousand, one hundred five".