51591289 has 8 divisors (see below), whose sum is σ = 55463040. Its totient is φ = 47835216.

The previous prime is 51591269. The next prime is 51591307. The reversal of 51591289 is 98219515.

51591289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51591289 - 2¹³ = 51583097 is a prime.

It is a super-2 number, since 2×51591289² = 5323322201363042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51591229) 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 7 ways as a sum of consecutive naturals, for example, 27994 + ... + 29779.

It is an arithmetic number, because the mean of its divisors is an integer number (6932880).

Almost surely, 2^51591289 is an apocalyptic number.

It is an amenable number.

51591289 is a deficient number, since it is larger than the sum of its proper divisors (3871751).

51591289 is a wasteful number, since it uses less digits than its factorization.

51591289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57839.

The product of its digits is 32400, while the sum is 40.

The square root of 51591289 is about 7182.7076370962. The cubic root of 51591289 is about 372.2706460140.

The spelling of 51591289 in words is "fifty-one million, five hundred ninety-one thousand, two hundred eighty-nine".