51816997 has 8 divisors (see below), whose sum is σ = 54108000. Its totient is φ = 49559664.

The previous prime is 51816991. The next prime is 51817001. The reversal of 51816997 is 79961815.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51816997 - 2¹¹ = 51814949 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 (51816991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5247 + ... + 11452.

It is an arithmetic number, because the mean of its divisors is an integer number (6763500).

Almost surely, 2^51816997 is an apocalyptic number.

It is an amenable number.

51816997 is a deficient number, since it is larger than the sum of its proper divisors (2291003).

51816997 is a wasteful number, since it uses less digits than its factorization.

51816997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16835.

The product of its digits is 136080, while the sum is 46.

The square root of 51816997 is about 7198.4023921979. The cubic root of 51816997 is about 372.8127415756.

The spelling of 51816997 in words is "fifty-one million, eight hundred sixteen thousand, nine hundred ninety-seven".