51280697 has 4 divisors (see below), whose sum is σ = 55225380. Its totient is φ = 47336016.

The previous prime is 51280693. The next prime is 51280711. The reversal of 51280697 is 79608215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79608215 = 5 ⋅15921643.

It can be written as a sum of positive squares in 2 ways, for example, as 6270016 + 45010681 = 2504^2 + 6709^2 .

It is not a de Polignac number, because 51280697 - 2² = 51280693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51280697.

It is not an unprimeable number, because it can be changed into a prime (51280693) 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, 1972322 + ... + 1972347.

It is an arithmetic number, because the mean of its divisors is an integer number (13806345).

Almost surely, 2^51280697 is an apocalyptic number.

It is an amenable number.

51280697 is a deficient number, since it is larger than the sum of its proper divisors (3944683).

51280697 is a wasteful number, since it uses less digits than its factorization.

51280697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3944682.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 51280697 is about 7161.0541821718. The cubic root of 51280697 is about 371.5220888151.

The spelling of 51280697 in words is "fifty-one million, two hundred eighty thousand, six hundred ninety-seven".