51043989 has 4 divisors (see below), whose sum is σ = 68058656. Its totient is φ = 34029324.

The previous prime is 51043987. The next prime is 51043999. The reversal of 51043989 is 98934015.

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 not a de Polignac number, because 51043989 - 2¹ = 51043987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51043987) 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, 8507329 + ... + 8507334.

It is an arithmetic number, because the mean of its divisors is an integer number (17014664).

Almost surely, 2^51043989 is an apocalyptic number.

It is an amenable number.

51043989 is a deficient number, since it is larger than the sum of its proper divisors (17014667).

51043989 is a wasteful number, since it uses less digits than its factorization.

51043989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17014666.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 51043989 is about 7144.5076107455. The cubic root of 51043989 is about 370.9495672783.

The spelling of 51043989 in words is "fifty-one million, forty-three thousand, nine hundred eighty-nine".