51326197 has 6 divisors (see below), whose sum is σ = 55302198. Its totient is φ = 47354184.

The previous prime is 51326153. The next prime is 51326203. The reversal of 51326197 is 79162315.

It can be written as a sum of positive squares in only one way, i.e., 35533521 + 15792676 = 5961^2 + 3974^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51326197 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 (51326147) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24838 + ... + 26824.

It is an arithmetic number, because the mean of its divisors is an integer number (9217033).

Almost surely, 2^51326197 is an apocalyptic number.

It is an amenable number.

51326197 is a deficient number, since it is larger than the sum of its proper divisors (3976001).

51326197 is an frugal number, since it uses more digits than its factorization.

51326197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987 (or 2000 counting only the distinct ones).

The product of its digits is 11340, while the sum is 34.

The square root of 51326197 is about 7164.2303843469. The cubic root of 51326197 is about 371.6319368926.

The spelling of 51326197 in words is "fifty-one million, three hundred twenty-six thousand, one hundred ninety-seven".