51366401 has 4 divisors (see below), whose sum is σ = 54387972. Its totient is φ = 48344832.

The previous prime is 51366379. The next prime is 51366433. The reversal of 51366401 is 10466315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23814400 + 27552001 = 4880^2 + 5249^2 .

It is a cyclic number.

It is not a de Polignac number, because 51366401 - 2¹⁴ = 51350017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51366451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1510760 + ... + 1510793.

It is an arithmetic number, because the mean of its divisors is an integer number (13596993).

Almost surely, 2^51366401 is an apocalyptic number.

It is an amenable number.

51366401 is a deficient number, since it is larger than the sum of its proper divisors (3021571).

51366401 is a wasteful number, since it uses less digits than its factorization.

51366401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3021570.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 51366401 is about 7167.0357191799. The cubic root of 51366401 is about 371.7289451251.

The spelling of 51366401 in words is "fifty-one million, three hundred sixty-six thousand, four hundred one".