55910191 has 4 divisors (see below), whose sum is σ = 57210472. Its totient is φ = 54609912.

The previous prime is 55910167. The next prime is 55910207. The reversal of 55910191 is 19101955.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19101955 = 5 ⋅3820391.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55910191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55910131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650076 + ... + 650161.

It is an arithmetic number, because the mean of its divisors is an integer number (14302618).

Almost surely, 2^55910191 is an apocalyptic number.

55910191 is a deficient number, since it is larger than the sum of its proper divisors (1300281).

55910191 is a wasteful number, since it uses less digits than its factorization.

55910191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300280.

The product of its (nonzero) digits is 2025, while the sum is 31.

The square root of 55910191 is about 7477.3117495528. The cubic root of 55910191 is about 382.3816051758.

The spelling of 55910191 in words is "fifty-five million, nine hundred ten thousand, one hundred ninety-one".