51564211 has 4 divisors (see below), whose sum is σ = 51599592. Its totient is φ = 51528832.

The previous prime is 51564203. The next prime is 51564239. The reversal of 51564211 is 11246515.

It is a happy number.

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 51564211 - 2³ = 51564203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51564241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15406 + ... + 18451.

It is an arithmetic number, because the mean of its divisors is an integer number (12899898).

Almost surely, 2^51564211 is an apocalyptic number.

51564211 is a deficient number, since it is larger than the sum of its proper divisors (35381).

51564211 is a wasteful number, since it uses less digits than its factorization.

51564211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35380.

The product of its digits is 1200, while the sum is 25.

The square root of 51564211 is about 7180.8224459319. The cubic root of 51564211 is about 372.2055051162.

The spelling of 51564211 in words is "fifty-one million, five hundred sixty-four thousand, two hundred eleven".