54921687 has 4 divisors (see below), whose sum is σ = 73228920. Its totient is φ = 36614456.

The previous prime is 54921683. The next prime is 54921689. The reversal of 54921687 is 78612945.

54921687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 54921687 - 2² = 54921683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54921683) 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 3 ways as a sum of consecutive naturals, for example, 9153612 + ... + 9153617.

It is an arithmetic number, because the mean of its divisors is an integer number (18307230).

Almost surely, 2^54921687 is an apocalyptic number.

54921687 is a deficient number, since it is larger than the sum of its proper divisors (18307233).

54921687 is a wasteful number, since it uses less digits than its factorization.

54921687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18307232.

The product of its digits is 120960, while the sum is 42.

The square root of 54921687 is about 7410.9167449108. The cubic root of 54921687 is about 380.1146629968.

The spelling of 54921687 in words is "fifty-four million, nine hundred twenty-one thousand, six hundred eighty-seven".