51280689 has 4 divisors (see below), whose sum is σ = 68374256. Its totient is φ = 34187124.

The previous prime is 51280681. The next prime is 51280693. The reversal of 51280689 is 98608215.

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 51280689 - 2³ = 51280681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51280681) 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, 8546779 + ... + 8546784.

It is an arithmetic number, because the mean of its divisors is an integer number (17093564).

Almost surely, 2^51280689 is an apocalyptic number.

It is an amenable number.

51280689 is a deficient number, since it is larger than the sum of its proper divisors (17093567).

51280689 is a wasteful number, since it uses less digits than its factorization.

51280689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17093566.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 51280689 is about 7161.0536235948. The cubic root of 51280689 is about 371.5220694954.

The spelling of 51280689 in words is "fifty-one million, two hundred eighty thousand, six hundred eighty-nine".