51999319 has 4 divisors (see below), whose sum is σ = 53404744. Its totient is φ = 50593896.

The previous prime is 51999317. The next prime is 51999329. The reversal of 51999319 is 91399915.

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

It is a cyclic number.

It is not a de Polignac number, because 51999319 - 2¹ = 51999317 is a prime.

It is a super-2 number, since 2×51999319² = 5407858352927522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51999317) 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, 702657 + ... + 702730.

It is an arithmetic number, because the mean of its divisors is an integer number (13351186).

Almost surely, 2^51999319 is an apocalyptic number.

51999319 is a deficient number, since it is larger than the sum of its proper divisors (1405425).

51999319 is a wasteful number, since it uses less digits than its factorization.

51999319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405424.

The product of its digits is 98415, while the sum is 46.

The square root of 51999319 is about 7211.0553319192. The cubic root of 51999319 is about 373.2494862899.

The spelling of 51999319 in words is "fifty-one million, nine hundred ninety-nine thousand, three hundred nineteen".