55891111 has 2 divisors, whose sum is σ = 55891112. Its totient is φ = 55891110.

The previous prime is 55891061. The next prime is 55891117. The reversal of 55891111 is 11119855.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55891111 - 2⁹ = 55890599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55891117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27945555 + 27945556.

It is an arithmetic number, because the mean of its divisors is an integer number (27945556).

Almost surely, 2^55891111 is an apocalyptic number.

55891111 is a deficient number, since it is larger than the sum of its proper divisors (1).

55891111 is an equidigital number, since it uses as much as digits as its factorization.

55891111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 31.

The square root of 55891111 is about 7476.0357810808. The cubic root of 55891111 is about 382.3381028436.

The spelling of 55891111 in words is "fifty-five million, eight hundred ninety-one thousand, one hundred eleven".