54721531 has 8 divisors (see below), whose sum is σ = 57657600. Its totient is φ = 51831912.

The previous prime is 54721517. The next prime is 54721543. The reversal of 54721531 is 13512745.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 54721531 - 2¹⁵ = 54688763 is a prime.

It is a super-2 number, since 2×54721531² = 5988891909967922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 54721531.

It is not an unprimeable number, because it can be changed into a prime (54721571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9181 + ... + 13918.

It is an arithmetic number, because the mean of its divisors is an integer number (7207200).

Almost surely, 2^54721531 is an apocalyptic number.

54721531 is a deficient number, since it is larger than the sum of its proper divisors (2936069).

54721531 is a wasteful number, since it uses less digits than its factorization.

54721531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23225.

The product of its digits is 4200, while the sum is 28.

The square root of 54721531 is about 7397.4002865872. The cubic root of 54721531 is about 379.6523389942.

The spelling of 54721531 in words is "fifty-four million, seven hundred twenty-one thousand, five hundred thirty-one".