55220313 has 4 divisors (see below), whose sum is σ = 73627088. Its totient is φ = 36813540.

The previous prime is 55220293. The next prime is 55220353. The reversal of 55220313 is 31302255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 55220313 - 2⁵ = 55220281 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55220313.

It is not an unprimeable number, because it can be changed into a prime (55220353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9203383 + ... + 9203388.

It is an arithmetic number, because the mean of its divisors is an integer number (18406772).

Almost surely, 2^55220313 is an apocalyptic number.

It is an amenable number.

55220313 is a deficient number, since it is larger than the sum of its proper divisors (18406775).

55220313 is a wasteful number, since it uses less digits than its factorization.

55220313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18406774.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 55220313 is about 7431.0371416109. The cubic root of 55220313 is about 380.8023513120.

Adding to 55220313 its reverse (31302255), we get a palindrome (86522568).

The spelling of 55220313 in words is "fifty-five million, two hundred twenty thousand, three hundred thirteen".