51306401 has 2 divisors, whose sum is σ = 51306402. Its totient is φ = 51306400.

The previous prime is 51306397. The next prime is 51306413. The reversal of 51306401 is 10460315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50751376 + 555025 = 7124^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 51306401 - 2² = 51306397 is a prime.

It is not a weakly prime, because it can be changed into another prime (51306421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25653200 + 25653201.

It is an arithmetic number, because the mean of its divisors is an integer number (25653201).

Almost surely, 2^51306401 is an apocalyptic number.

It is an amenable number.

51306401 is a deficient number, since it is larger than the sum of its proper divisors (1).

51306401 is an equidigital number, since it uses as much as digits as its factorization.

51306401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 51306401 is about 7162.8486651611. The cubic root of 51306401 is about 371.5841525104.

Adding to 51306401 its reverse (10460315), we get a palindrome (61766716).

The spelling of 51306401 in words is "fifty-one million, three hundred six thousand, four hundred one".