51512022 has 24 divisors (see below), whose sum is σ = 114206664. Its totient is φ = 16771104.

The previous prime is 51512011. The next prime is 51512039. The reversal of 51512022 is 22021515.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 51511986 and 51512004.

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, 32503 + ... + 34050.

It is an arithmetic number, because the mean of its divisors is an integer number (4758611).

Almost surely, 2^51512022 is an apocalyptic number.

51512022 is an abundant number, since it is smaller than the sum of its proper divisors (62694642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51512022 is a wasteful number, since it uses less digits than its factorization.

51512022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66604 (or 66601 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51512022 is about 7177.1876107567. The cubic root of 51512022 is about 372.0798909232.

Adding to 51512022 its reverse (22021515), we get a palindrome (73533537).

The spelling of 51512022 in words is "fifty-one million, five hundred twelve thousand, twenty-two".