51897617 has 8 divisors (see below), whose sum is σ = 56845800. Its totient is φ = 47160064.

The previous prime is 51897613. The next prime is 51897631. The reversal of 51897617 is 71679815.

51897617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 7204²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 5125696 + 46771921 = 2264^2 + 6839^2 .

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 51897617 - 2² = 51897613 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51897611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52142 + ... + 53127.

It is an arithmetic number, because the mean of its divisors is an integer number (7105725).

Almost surely, 2^51897617 is an apocalyptic number.

It is an amenable number.

51897617 is a deficient number, since it is larger than the sum of its proper divisors (4948183).

51897617 is a wasteful number, since it uses less digits than its factorization.

51897617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105315.

The product of its digits is 105840, while the sum is 44.

The square root of 51897617 is about 7204.0000694059. Note that the first 4 decimals coincide. The cubic root of 51897617 is about 373.0059895489.

The spelling of 51897617 in words is "fifty-one million, eight hundred ninety-seven thousand, six hundred seventeen".