51555001 has 4 divisors (see below), whose sum is σ = 51569892. Its totient is φ = 51540112.

The previous prime is 51554969. The next prime is 51555047. The reversal of 51555001 is 10055515.

51555001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 51494976 + 60025 = 7176^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 51555001 - 2⁵ = 51554969 is a prime.

It is a super-2 number, since 2×51555001² = 5315836256220002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51555601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771 + ... + 10183.

It is an arithmetic number, because the mean of its divisors is an integer number (12892473).

Almost surely, 2^51555001 is an apocalyptic number.

It is an amenable number.

51555001 is a deficient number, since it is larger than the sum of its proper divisors (14891).

51555001 is an equidigital number, since it uses as much as digits as its factorization.

51555001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14890.

The product of its (nonzero) digits is 625, while the sum is 22.

The square root of 51555001 is about 7180.1811258491. The cubic root of 51555001 is about 372.1833436419.

The spelling of 51555001 in words is "fifty-one million, five hundred fifty-five thousand, one".