51515422 has 24 divisors (see below), whose sum is σ = 93213936. Its totient is φ = 20913984.

The previous prime is 51515407. The next prime is 51515447. The reversal of 51515422 is 22451515.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43 + ... + 10150.

It is an arithmetic number, because the mean of its divisors is an integer number (3883914).

Almost surely, 2^51515422 is an apocalyptic number.

51515422 is a deficient number, since it is larger than the sum of its proper divisors (41698514).

51515422 is a wasteful number, since it uses less digits than its factorization.

51515422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10240 (or 10221 counting only the distinct ones).

The product of its digits is 2000, while the sum is 25.

The square root of 51515422 is about 7177.4244684288. The cubic root of 51515422 is about 372.0880769980.

Adding to 51515422 its reverse (22451515), we get a palindrome (73966937).

The spelling of 51515422 in words is "fifty-one million, five hundred fifteen thousand, four hundred twenty-two".