55101215 has 16 divisors (see below), whose sum is σ = 74305728. Its totient is φ = 38919936.

The previous prime is 55101187. The next prime is 55101217. The reversal of 55101215 is 51210155.

55101215 = T₂₇₀₃ + T₂₇₀₄ + ... + T₂₇₁₇.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 55101215 - 2⁸ = 55100959 is a prime.

It is a super-2 number, since 2×55101215² = 6072287788952450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55101217) 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, 16934 + ... + 19923.

It is an arithmetic number, because the mean of its divisors is an integer number (4644108).

Almost surely, 2^55101215 is an apocalyptic number.

55101215 is a deficient number, since it is larger than the sum of its proper divisors (19204513).

55101215 is a wasteful number, since it uses less digits than its factorization.

55101215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36898.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 55101215 is about 7423.0192644233. The cubic root of 55101215 is about 380.5283854445.

The spelling of 55101215 in words is "fifty-five million, one hundred one thousand, two hundred fifteen".