51287201 has 4 divisors (see below), whose sum is σ = 58613952. Its totient is φ = 43960452.

The previous prime is 51287191. The next prime is 51287209. The reversal of 51287201 is 10278215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51287201 - 2¹⁸ = 51025057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51287209) 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, 3663365 + ... + 3663378.

It is an arithmetic number, because the mean of its divisors is an integer number (14653488).

Almost surely, 2^51287201 is an apocalyptic number.

It is an amenable number.

51287201 is a deficient number, since it is larger than the sum of its proper divisors (7326751).

51287201 is an equidigital number, since it uses as much as digits as its factorization.

51287201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7326750.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 51287201 is about 7161.5082908561. The cubic root of 51287201 is about 371.5377950337.

The spelling of 51287201 in words is "fifty-one million, two hundred eighty-seven thousand, two hundred one".