51116587 has 4 divisors (see below), whose sum is σ = 51170416. Its totient is φ = 51062760.

The previous prime is 51116581. The next prime is 51116591. The reversal of 51116587 is 78561115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78561115 = 5 ⋅15712223.

It is a cyclic number.

It is not a de Polignac number, because 51116587 - 2³ = 51116579 is a prime.

It is a super-2 number, since 2×51116587² = 5225810933057138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51116581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25464 + ... + 27397.

It is an arithmetic number, because the mean of its divisors is an integer number (12792604).

Almost surely, 2^51116587 is an apocalyptic number.

51116587 is a deficient number, since it is larger than the sum of its proper divisors (53829).

51116587 is an equidigital number, since it uses as much as digits as its factorization.

51116587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53828.

The product of its digits is 8400, while the sum is 34.

The square root of 51116587 is about 7149.5864915392. The cubic root of 51116587 is about 371.1253466405.

The spelling of 51116587 in words is "fifty-one million, one hundred sixteen thousand, five hundred eighty-seven".