51039889 has 4 divisors (see below), whose sum is σ = 51119424. Its totient is φ = 50960356.

The previous prime is 51039847. The next prime is 51039893. The reversal of 51039889 is 98893015.

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 51039889 - 2¹¹ = 51037841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51039589) 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, 38797 + ... + 40090.

It is an arithmetic number, because the mean of its divisors is an integer number (12779856).

Almost surely, 2^51039889 is an apocalyptic number.

It is an amenable number.

51039889 is a deficient number, since it is larger than the sum of its proper divisors (79535).

51039889 is an equidigital number, since it uses as much as digits as its factorization.

51039889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79534.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 51039889 is about 7144.2206712839. The cubic root of 51039889 is about 370.9396351003.

The spelling of 51039889 in words is "fifty-one million, thirty-nine thousand, eight hundred eighty-nine".