51256211 has 4 divisors (see below), whose sum is σ = 52641552. Its totient is φ = 49870872.

The previous prime is 51256201. The next prime is 51256217. The reversal of 51256211 is 11265215.

It is a happy number.

51256211 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.

It is a cyclic number.

It is not a de Polignac number, because 51256211 - 2²² = 47061907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51256217) 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, 692615 + ... + 692688.

It is an arithmetic number, because the mean of its divisors is an integer number (13160388).

Almost surely, 2^51256211 is an apocalyptic number.

51256211 is a deficient number, since it is larger than the sum of its proper divisors (1385341).

51256211 is a wasteful number, since it uses less digits than its factorization.

51256211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385340.

The product of its digits is 600, while the sum is 23.

The square root of 51256211 is about 7159.3443135527. The cubic root of 51256211 is about 371.4629467551.

The spelling of 51256211 in words is "fifty-one million, two hundred fifty-six thousand, two hundred eleven".