51512406 has 32 divisors (see below), whose sum is σ = 113401728. Its totient is φ = 15469440.

The previous prime is 51512389. The next prime is 51512407. The reversal of 51512406 is 60421515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51512407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4005 + ... + 10911.

It is an arithmetic number, because the mean of its divisors is an integer number (3543804).

Almost surely, 2^51512406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51512406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56700864).

51512406 is an abundant number, since it is smaller than the sum of its proper divisors (61889322).

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

51512406 is a wasteful number, since it uses less digits than its factorization.

51512406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7036.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 51512406 is about 7177.2143621324. The cubic root of 51512406 is about 372.0808154862.

It can be divided in two parts, 5151 and 2406, that added together give a palindrome (7557).

The spelling of 51512406 in words is "fifty-one million, five hundred twelve thousand, four hundred six".