55312111 has 2 divisors, whose sum is σ = 55312112. Its totient is φ = 55312110.

The previous prime is 55312099. The next prime is 55312121. The reversal of 55312111 is 11121355.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55312111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55312121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27656055 + 27656056.

It is an arithmetic number, because the mean of its divisors is an integer number (27656056).

Almost surely, 2^55312111 is an apocalyptic number.

55312111 is a deficient number, since it is larger than the sum of its proper divisors (1).

55312111 is an equidigital number, since it uses as much as digits as its factorization.

55312111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150, while the sum is 19.

The square root of 55312111 is about 7437.2112380919. The cubic root of 55312111 is about 381.0132491954.

Adding to 55312111 its reverse (11121355), we get a palindrome (66433466).

The spelling of 55312111 in words is "fifty-five million, three hundred twelve thousand, one hundred eleven".