54998991 has 18 divisors (see below), whose sum is σ = 82101240. Its totient is φ = 35477640.

The previous prime is 54998989. The next prime is 54999011. The reversal of 54998991 is 19989945.

54998991 is a `hidden beast` number, since 549 + 9 + 8 + 9 + 91 = 666.

It is not a de Polignac number, because 54998991 - 2¹ = 54998989 is a prime.

It is a super-2 number, since 2×54998991² = 6049778022036162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54998941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5470 + ... + 11828.

It is an arithmetic number, because the mean of its divisors is an integer number (4561180).

Almost surely, 2^54998991 is an apocalyptic number.

54998991 is a deficient number, since it is larger than the sum of its proper divisors (27102249).

54998991 is a wasteful number, since it uses less digits than its factorization.

54998991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6427 (or 6393 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The square root of 54998991 is about 7416.1304600175. The cubic root of 54998991 is about 380.2929204989.

The spelling of 54998991 in words is "fifty-four million, nine hundred ninety-eight thousand, nine hundred ninety-one".