51617801 has 2 divisors, whose sum is σ = 51617802. Its totient is φ = 51617800.

The previous prime is 51617777. The next prime is 51617809. The reversal of 51617801 is 10871615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50410000 + 1207801 = 7100^2 + 1099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51617801 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51617809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25808900 + 25808901.

It is an arithmetic number, because the mean of its divisors is an integer number (25808901).

Almost surely, 2^51617801 is an apocalyptic number.

It is an amenable number.

51617801 is a deficient number, since it is larger than the sum of its proper divisors (1).

51617801 is an equidigital number, since it uses as much as digits as its factorization.

51617801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 29.

The square root of 51617801 is about 7184.5529436424. The cubic root of 51617801 is about 372.3344032194.

The spelling of 51617801 in words is "fifty-one million, six hundred seventeen thousand, eight hundred one".