55813215 has 16 divisors (see below), whose sum is σ = 89566848. Its totient is φ = 29678496.

The previous prime is 55813213. The next prime is 55813217. The reversal of 55813215 is 51231855.

It is an interprime number because it is at equal distance from previous prime (55813213) and next prime (55813217).

It is not a de Polignac number, because 55813215 - 2¹ = 55813213 is a prime.

It is a super-2 number, since 2×55813215² = 6230229937272450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55813213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157 + ... + 10566.

It is an arithmetic number, because the mean of its divisors is an integer number (5597928).

Almost surely, 2^55813215 is an apocalyptic number.

55813215 is a deficient number, since it is larger than the sum of its proper divisors (33753633).

55813215 is a wasteful number, since it uses less digits than its factorization.

55813215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11078.

The product of its digits is 6000, while the sum is 30.

The square root of 55813215 is about 7470.8242517141. The cubic root of 55813215 is about 382.1603974497.

The spelling of 55813215 in words is "fifty-five million, eight hundred thirteen thousand, two hundred fifteen".