51345481 has 4 divisors (see below), whose sum is σ = 56013264. Its totient is φ = 46677700.

The previous prime is 51345473. The next prime is 51345487. The reversal of 51345481 is 18454315.

51345481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 51345481 - 2³ = 51345473 is a prime.

It is a super-2 number, since 2×51345481² = 5272716838242722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51345487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2333875 + ... + 2333896.

It is an arithmetic number, because the mean of its divisors is an integer number (14003316).

Almost surely, 2^51345481 is an apocalyptic number.

It is an amenable number.

51345481 is a deficient number, since it is larger than the sum of its proper divisors (4667783).

51345481 is a wasteful number, since it uses less digits than its factorization.

51345481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4667782.

The product of its digits is 9600, while the sum is 31.

The square root of 51345481 is about 7165.5761108232. The cubic root of 51345481 is about 371.6784735760.

Adding to 51345481 its reverse (18454315), we get a palindrome (69799796).

The spelling of 51345481 in words is "fifty-one million, three hundred forty-five thousand, four hundred eighty-one".