55145911 has 2 divisors, whose sum is σ = 55145912. Its totient is φ = 55145910.

The previous prime is 55145843. The next prime is 55145933. The reversal of 55145911 is 11954155.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55145911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55145411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27572955 + 27572956.

It is an arithmetic number, because the mean of its divisors is an integer number (27572956).

Almost surely, 2^55145911 is an apocalyptic number.

55145911 is a deficient number, since it is larger than the sum of its proper divisors (1).

55145911 is an equidigital number, since it uses as much as digits as its factorization.

55145911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4500, while the sum is 31.

The square root of 55145911 is about 7426.0292889269. The cubic root of 55145911 is about 380.6312476652.

The spelling of 55145911 in words is "fifty-five million, one hundred forty-five thousand, nine hundred eleven".