51585389 has 4 divisors (see below), whose sum is σ = 53828256. Its totient is φ = 49342524.

The previous prime is 51585383. The next prime is 51585397. The reversal of 51585389 is 98358515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51585389 - 2²⁰ = 50536813 is a prime.

It is a super-2 number, since 2×51585389² = 5322104716562642, 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 (51585383) 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, 1121399 + ... + 1121444.

It is an arithmetic number, because the mean of its divisors is an integer number (13457064).

Almost surely, 2^51585389 is an apocalyptic number.

It is an amenable number.

51585389 is a deficient number, since it is larger than the sum of its proper divisors (2242867).

51585389 is a wasteful number, since it uses less digits than its factorization.

51585389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242866.

The product of its digits is 216000, while the sum is 44.

The square root of 51585389 is about 7182.2969167252. The cubic root of 51585389 is about 372.2564544674.

The spelling of 51585389 in words is "fifty-one million, five hundred eighty-five thousand, three hundred eighty-nine".