55620111 has 16 divisors (see below), whose sum is σ = 75132288. Its totient is φ = 36597600.

The previous prime is 55620109. The next prime is 55620127. The reversal of 55620111 is 11102655.

55620111 = 324² + 325² + ... + 585².

It is not a de Polignac number, because 55620111 - 2¹ = 55620109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55620101) 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, 120421 + ... + 120881.

It is an arithmetic number, because the mean of its divisors is an integer number (4695768).

Almost surely, 2^55620111 is an apocalyptic number.

55620111 is a deficient number, since it is larger than the sum of its proper divisors (19512177).

55620111 is a wasteful number, since it uses less digits than its factorization.

55620111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 55620111 is about 7457.8891785813. The cubic root of 55620111 is about 381.7191520489.

Adding to 55620111 its reverse (11102655), we get a palindrome (66722766).

The spelling of 55620111 in words is "fifty-five million, six hundred twenty thousand, one hundred eleven".