51115506 has 32 divisors (see below), whose sum is σ = 111749568. Its totient is φ = 15491520.

The previous prime is 51115483. The next prime is 51115511. The reversal of 51115506 is 60551115.

It is a super-2 number, since 2×51115506² = 5225589907272072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336 + ... + 10116.

It is an arithmetic number, because the mean of its divisors is an integer number (3492174).

Almost surely, 2^51115506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51115506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55874784).

51115506 is an abundant number, since it is smaller than the sum of its proper divisors (60634062).

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

51115506 is a wasteful number, since it uses less digits than its factorization.

51115506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9866.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 51115506 is about 7149.5108923618. The cubic root of 51115506 is about 371.1227304686.

The spelling of 51115506 in words is "fifty-one million, one hundred fifteen thousand, five hundred six".