51617999 has 4 divisors (see below), whose sum is σ = 53397960. Its totient is φ = 49838040.

The previous prime is 51617983. The next prime is 51618011. The reversal of 51617999 is 99971615.

51617999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99971615 = 5 ⋅19994323.

It is a cyclic number.

It is not a de Polignac number, because 51617999 - 2⁴ = 51617983 is a prime.

It is a super-3 number, since 3×51617999³ (a number of 24 digits) contains 333 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 (51617959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 889937 + ... + 889994.

It is an arithmetic number, because the mean of its divisors is an integer number (13349490).

Almost surely, 2^51617999 is an apocalyptic number.

51617999 is a deficient number, since it is larger than the sum of its proper divisors (1779961).

51617999 is a wasteful number, since it uses less digits than its factorization.

51617999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779960.

The product of its digits is 153090, while the sum is 47.

The square root of 51617999 is about 7184.5667231922. The cubic root of 51617999 is about 372.3348792962.

The spelling of 51617999 in words is "fifty-one million, six hundred seventeen thousand, nine hundred ninety-nine".