51589381 has 4 divisors (see below), whose sum is σ = 52316064. Its totient is φ = 50862700.

The previous prime is 51589361. The next prime is 51589387. The reversal of 51589381 is 18398515.

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 a de Polignac number, because none of the positive numbers 2^k-51589381 is a prime.

It is a super-4 number, since 4×51589381⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51589387) 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, 363235 + ... + 363376.

It is an arithmetic number, because the mean of its divisors is an integer number (13079016).

Almost surely, 2^51589381 is an apocalyptic number.

It is an amenable number.

51589381 is a deficient number, since it is larger than the sum of its proper divisors (726683).

51589381 is an equidigital number, since it uses as much as digits as its factorization.

51589381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726682.

The product of its digits is 43200, while the sum is 40.

The square root of 51589381 is about 7182.5748168745. The cubic root of 51589381 is about 372.2660567305.

The spelling of 51589381 in words is "fifty-one million, five hundred eighty-nine thousand, three hundred eighty-one".