51530797 has 4 divisors (see below), whose sum is σ = 52031200. Its totient is φ = 51030396.

The previous prime is 51530783. The next prime is 51530803. The reversal of 51530797 is 79703515.

It is a happy number.

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 51530797 - 2¹⁹ = 51006509 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 (51530707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250047 + ... + 250252.

It is an arithmetic number, because the mean of its divisors is an integer number (13007800).

Almost surely, 2^51530797 is an apocalyptic number.

It is an amenable number.

51530797 is a deficient number, since it is larger than the sum of its proper divisors (500403).

51530797 is a wasteful number, since it uses less digits than its factorization.

51530797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500402.

The product of its (nonzero) digits is 33075, while the sum is 37.

The square root of 51530797 is about 7178.4954551772. The cubic root of 51530797 is about 372.1250904134.

The spelling of 51530797 in words is "fifty-one million, five hundred thirty thousand, seven hundred ninety-seven".