54931891 has 12 divisors (see below), whose sum is σ = 64986840. Its totient is φ = 46284000.

The previous prime is 54931883. The next prime is 54931901. The reversal of 54931891 is 19813945.

54931891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 54931891 - 2³ = 54931883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54931801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6610 + ... + 12391.

It is an arithmetic number, because the mean of its divisors is an integer number (5415570).

Almost surely, 2^54931891 is an apocalyptic number.

54931891 is a deficient number, since it is larger than the sum of its proper divisors (10054949).

54931891 is a wasteful number, since it uses less digits than its factorization.

54931891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19074 (or 19067 counting only the distinct ones).

The product of its digits is 38880, while the sum is 40.

The square root of 54931891 is about 7411.6051567795. The cubic root of 54931891 is about 380.1382022703.

The spelling of 54931891 in words is "fifty-four million, nine hundred thirty-one thousand, eight hundred ninety-one".