54391685 has 4 divisors (see below), whose sum is σ = 65270028. Its totient is φ = 43513344.

The previous prime is 54391679. The next prime is 54391691. The reversal of 54391685 is 58619345.

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

It is an interprime number because it is at equal distance from previous prime (54391679) and next prime (54391691).

It can be written as a sum of positive squares in 2 ways, for example, as 12802084 + 41589601 = 3578^2 + 6449^2 .

It is a cyclic number.

It is not a de Polignac number, because 54391685 - 2⁴ = 54391669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5439164 + ... + 5439173.

It is an arithmetic number, because the mean of its divisors is an integer number (16317507).

Almost surely, 2^54391685 is an apocalyptic number.

It is an amenable number.

54391685 is a deficient number, since it is larger than the sum of its proper divisors (10878343).

54391685 is a wasteful number, since it uses less digits than its factorization.

54391685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10878342.

The product of its digits is 129600, while the sum is 41.

The square root of 54391685 is about 7375.0718640566. The cubic root of 54391685 is about 378.8879886569.

The spelling of 54391685 in words is "fifty-four million, three hundred ninety-one thousand, six hundred eighty-five".