54031821 has 4 divisors (see below), whose sum is σ = 72042432. Its totient is φ = 36021212.

The previous prime is 54031819. The next prime is 54031823. The reversal of 54031821 is 12813045.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (54031819) and next prime (54031823).

It is a cyclic number.

It is not a de Polignac number, because 54031821 - 2¹ = 54031819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 54031791 and 54031800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54031823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9005301 + ... + 9005306.

It is an arithmetic number, because the mean of its divisors is an integer number (18010608).

Almost surely, 2^54031821 is an apocalyptic number.

It is an amenable number.

54031821 is a deficient number, since it is larger than the sum of its proper divisors (18010611).

54031821 is a wasteful number, since it uses less digits than its factorization.

54031821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18010610.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 54031821 is about 7350.6340542840. The cubic root of 54031821 is about 378.0505447374.

Adding to 54031821 its reverse (12813045), we get a palindrome (66844866).

The spelling of 54031821 in words is "fifty-four million, thirty-one thousand, eight hundred twenty-one".