54991805 has 32 divisors (see below), whose sum is σ = 75316608. Its totient is φ = 38188800.

The previous prime is 54991777. The next prime is 54991813. The reversal of 54991805 is 50819945.

It is a happy number.

It is not a de Polignac number, because 54991805 - 2¹⁰ = 54990781 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123914 + ... + 124356.

It is an arithmetic number, because the mean of its divisors is an integer number (2353644).

Almost surely, 2^54991805 is an apocalyptic number.

54991805 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

54991805 is a deficient number, since it is larger than the sum of its proper divisors (20324803).

54991805 is a wasteful number, since it uses less digits than its factorization.

54991805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 54991805 is about 7415.6459597260. The cubic root of 54991805 is about 380.2763571407.

The spelling of 54991805 in words is "fifty-four million, nine hundred ninety-one thousand, eight hundred five".