55213917 has 16 divisors (see below), whose sum is σ = 80830272. Its totient is φ = 33246720.

The previous prime is 55213913. The next prime is 55213933. The reversal of 55213917 is 71931255.

It is not a de Polignac number, because 55213917 - 2² = 55213913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55213913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148 + ... + 10509.

It is an arithmetic number, because the mean of its divisors is an integer number (5051892).

Almost surely, 2^55213917 is an apocalyptic number.

It is an amenable number.

55213917 is a deficient number, since it is larger than the sum of its proper divisors (25616355).

55213917 is a wasteful number, since it uses less digits than its factorization.

55213917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10828.

The product of its digits is 9450, while the sum is 33.

The square root of 55213917 is about 7430.6067719938. The cubic root of 55213917 is about 380.7876483537.

The spelling of 55213917 in words is "fifty-five million, two hundred thirteen thousand, nine hundred seventeen".