55806111 has 8 divisors (see below), whose sum is σ = 82675760. Its totient is φ = 37204056.

The previous prime is 55806089. The next prime is 55806133. The reversal of 55806111 is 11160855.

It is an interprime number because it is at equal distance from previous prime (55806089) and next prime (55806133).

It is not a de Polignac number, because 55806111 - 2¹³ = 55797919 is a prime.

It is a super-2 number, since 2×55806111² = 6228644049888642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2066893 = 55806111 / (5 + 5 + 8 + 0 + 6 + 1 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55806161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1033420 + ... + 1033473.

It is an arithmetic number, because the mean of its divisors is an integer number (10334470).

Almost surely, 2^55806111 is an apocalyptic number.

55806111 is a deficient number, since it is larger than the sum of its proper divisors (26869649).

55806111 is a wasteful number, since it uses less digits than its factorization.

55806111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066902 (or 2066896 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 55806111 is about 7470.3487870380. The cubic root of 55806111 is about 382.1441827554.

Adding to 55806111 its reverse (11160855), we get a palindrome (66966966).

The spelling of 55806111 in words is "fifty-five million, eight hundred six thousand, one hundred eleven".