51697201 has 2 divisors, whose sum is σ = 51697202. Its totient is φ = 51697200.

The previous prime is 51697193. The next prime is 51697237. The reversal of 51697201 is 10279615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46566976 + 5130225 = 6824^2 + 2265^2 .

It is a cyclic number.

It is not a de Polignac number, because 51697201 - 2³ = 51697193 is a prime.

It is equal to p_3096724 and since 51697201 and 3096724 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (51695201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25848600 + 25848601.

It is an arithmetic number, because the mean of its divisors is an integer number (25848601).

Almost surely, 2^51697201 is an apocalyptic number.

51697201 is the 3216-th centered decagonal number.

It is an amenable number.

51697201 is a deficient number, since it is larger than the sum of its proper divisors (1).

51697201 is an equidigital number, since it uses as much as digits as its factorization.

51697201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 51697201 is about 7190.0765642655. The cubic root of 51697201 is about 372.5252172769.

The spelling of 51697201 in words is "fifty-one million, six hundred ninety-seven thousand, two hundred one".