51306197 has 2 divisors, whose sum is σ = 51306198. Its totient is φ = 51306196.

The previous prime is 51306193. The next prime is 51306239. The reversal of 51306197 is 79160315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49014001 + 2292196 = 7001^2 + 1514^2 .

It is a cyclic number.

It is not a de Polignac number, because 51306197 - 2² = 51306193 is a prime.

It is equal to p_3074666 and since 51306197 and 3074666 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51306193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25653098 + 25653099.

It is an arithmetic number, because the mean of its divisors is an integer number (25653099).

Almost surely, 2^51306197 is an apocalyptic number.

It is an amenable number.

51306197 is a deficient number, since it is larger than the sum of its proper divisors (1).

51306197 is an equidigital number, since it uses as much as digits as its factorization.

51306197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 51306197 is about 7162.8344250024. The cubic root of 51306197 is about 371.5836600230.

The spelling of 51306197 in words is "fifty-one million, three hundred six thousand, one hundred ninety-seven".