51135899 has 4 divisors (see below), whose sum is σ = 51150600. Its totient is φ = 51121200.

The previous prime is 51135893. The next prime is 51135943. The reversal of 51135899 is 99853115.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51135899 is a prime.

It is a super-2 number, since 2×51135899² = 5229760333076402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51135893) 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, 1127 + ... + 10175.

It is an arithmetic number, because the mean of its divisors is an integer number (12787650).

Almost surely, 2^51135899 is an apocalyptic number.

51135899 is a deficient number, since it is larger than the sum of its proper divisors (14701).

51135899 is an equidigital number, since it uses as much as digits as its factorization.

51135899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14700.

The product of its digits is 48600, while the sum is 41.

The square root of 51135899 is about 7150.9369316195. The cubic root of 51135899 is about 371.1720781792.

The spelling of 51135899 in words is "fifty-one million, one hundred thirty-five thousand, eight hundred ninety-nine".