54221691 has 16 divisors (see below), whose sum is σ = 74188800. Its totient is φ = 35208768.

The previous prime is 54221669. The next prime is 54221707. The reversal of 54221691 is 19612245.

It is not a de Polignac number, because 54221691 - 2²² = 50027387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (54221641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32895 + ... + 34503.

It is an arithmetic number, because the mean of its divisors is an integer number (4636800).

Almost surely, 2^54221691 is an apocalyptic number.

54221691 is a deficient number, since it is larger than the sum of its proper divisors (19967109).

54221691 is a wasteful number, since it uses less digits than its factorization.

54221691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898.

The product of its digits is 4320, while the sum is 30.

The square root of 54221691 is about 7363.5379404197. The cubic root of 54221691 is about 378.4928553336.

The spelling of 54221691 in words is "fifty-four million, two hundred twenty-one thousand, six hundred ninety-one".