54131721 has 12 divisors (see below), whose sum is σ = 83959632. Its totient is φ = 30932328.

The previous prime is 54131717. The next prime is 54131729. The reversal of 54131721 is 12713145.

It is not a de Polignac number, because 54131721 - 2² = 54131717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 54131691 and 54131700.

It is not an unprimeable number, because it can be changed into a prime (54131729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183975 + ... + 184268.

It is an arithmetic number, because the mean of its divisors is an integer number (6996636).

Almost surely, 2^54131721 is an apocalyptic number.

It is an amenable number.

54131721 is a deficient number, since it is larger than the sum of its proper divisors (29827911).

54131721 is a wasteful number, since it uses less digits than its factorization.

54131721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368260 (or 368253 counting only the distinct ones).

The product of its digits is 840, while the sum is 24.

The square root of 54131721 is about 7357.4262483561. The cubic root of 54131721 is about 378.2833951609.

Adding to 54131721 its reverse (12713145), we get a palindrome (66844866).

The spelling of 54131721 in words is "fifty-four million, one hundred thirty-one thousand, seven hundred twenty-one".