54005123531 has 4 divisors (see below), whose sum is σ = 55867369200. Its totient is φ = 52142877864.

The previous prime is 54005123509. The next prime is 54005123533. The reversal of 54005123531 is 13532150045.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54005123531 is a prime.

It is a super-2 number, since 2×54005123531² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 1862245639 = 54005123531 / (5 + 4 + 0 + 0 + 5 + 1 + 2 + 3 + 5 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 54005123494 and 54005123503.

It is not an unprimeable number, because it can be changed into a prime (54005123533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 931122791 + ... + 931122848.

It is an arithmetic number, because the mean of its divisors is an integer number (13966842300).

Almost surely, 2^54005123531 is an apocalyptic number.

54005123531 is a deficient number, since it is larger than the sum of its proper divisors (1862245669).

54005123531 is a wasteful number, since it uses less digits than its factorization.

54005123531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862245668.

The product of its (nonzero) digits is 9000, while the sum is 29.

Adding to 54005123531 its reverse (13532150045), we get a palindrome (67537273576).

The spelling of 54005123531 in words is "fifty-four billion, five million, one hundred twenty-three thousand, five hundred thirty-one".