54659781 has 24 divisors (see below), whose sum is σ = 86542560. Its totient is φ = 32968800.

The previous prime is 54659771. The next prime is 54659797. The reversal of 54659781 is 18795645.

54659781 is a `hidden beast` number, since 54 + 6 + 597 + 8 + 1 = 666.

It is not a de Polignac number, because 54659781 - 2⁵ = 54659749 is a prime.

It is a super-2 number, since 2×54659781² = 5975383317935922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54659771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21466 + ... + 23876.

It is an arithmetic number, because the mean of its divisors is an integer number (3605940).

Almost surely, 2^54659781 is an apocalyptic number.

It is an amenable number.

54659781 is a deficient number, since it is larger than the sum of its proper divisors (31882779).

54659781 is a wasteful number, since it uses less digits than its factorization.

54659781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2657 (or 2654 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 54659781 is about 7393.2253448681. The cubic root of 54659781 is about 379.5094802008.

The spelling of 54659781 in words is "fifty-four million, six hundred fifty-nine thousand, seven hundred eighty-one".