55081791 has 24 divisors (see below), whose sum is σ = 81791424. Its totient is φ = 35703360.

The previous prime is 55081783. The next prime is 55081799. The reversal of 55081791 is 19718055.

55081791 is a `hidden beast` number, since 550 + 8 + 17 + 91 = 666.

It is an interprime number because it is at equal distance from previous prime (55081783) and next prime (55081799).

It is not a de Polignac number, because 55081791 - 2³ = 55081783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55081799) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83001 + ... + 83661.

It is an arithmetic number, because the mean of its divisors is an integer number (3407976).

Almost surely, 2^55081791 is an apocalyptic number.

55081791 is a deficient number, since it is larger than the sum of its proper divisors (26709633).

55081791 is a wasteful number, since it uses less digits than its factorization.

55081791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The square root of 55081791 is about 7421.7107866044. The cubic root of 55081791 is about 380.4836662124.

The spelling of 55081791 in words is "fifty-five million, eighty-one thousand, seven hundred ninety-one".