51999299 has 4 divisors (see below), whose sum is σ = 56726520. Its totient is φ = 47272080.

The previous prime is 51999281. The next prime is 51999317. The reversal of 51999299 is 99299915.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (51999281) and next prime (51999317).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51999299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51999299.

It is not an unprimeable number, because it can be changed into a prime (51999799) 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, 2363594 + ... + 2363615.

It is an arithmetic number, because the mean of its divisors is an integer number (14181630).

Almost surely, 2^51999299 is an apocalyptic number.

51999299 is a deficient number, since it is larger than the sum of its proper divisors (4727221).

51999299 is a wasteful number, since it uses less digits than its factorization.

51999299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4727220.

The product of its digits is 590490, while the sum is 53.

The square root of 51999299 is about 7211.0539451595. The cubic root of 51999299 is about 373.2494384368.

The spelling of 51999299 in words is "fifty-one million, nine hundred ninety-nine thousand, two hundred ninety-nine".