51538481 has 8 divisors (see below), whose sum is σ = 53647680. Its totient is φ = 49451472.

The previous prime is 51538471. The next prime is 51538489. The reversal of 51538481 is 18483515.

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 51538481 - 2²² = 47344177 is a prime.

It is a super-2 number, since 2×51538481² = 5312430047574722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51538489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725 + ... + 10178.

It is an arithmetic number, because the mean of its divisors is an integer number (6705960).

Almost surely, 2^51538481 is an apocalyptic number.

It is an amenable number.

51538481 is a deficient number, since it is larger than the sum of its proper divisors (2109199).

51538481 is a wasteful number, since it uses less digits than its factorization.

51538481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11095.

The product of its digits is 19200, while the sum is 35.

The square root of 51538481 is about 7179.0306448712. The cubic root of 51538481 is about 372.1435859361.

The spelling of 51538481 in words is "fifty-one million, five hundred thirty-eight thousand, four hundred eighty-one".