51106209 has 16 divisors (see below), whose sum is σ = 84956160. Its totient is φ = 26548560.

The previous prime is 51106183. The next prime is 51106217. The reversal of 51106209 is 90260115.

It is not a de Polignac number, because 51106209 - 2⁵ = 51106177 is a prime.

It is a super-2 number, since 2×51106209² = 5223689196703362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51106229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110389 + ... + 110850.

It is an arithmetic number, because the mean of its divisors is an integer number (5309760).

Almost surely, 2^51106209 is an apocalyptic number.

It is an amenable number.

51106209 is a deficient number, since it is larger than the sum of its proper divisors (33849951).

51106209 is a wasteful number, since it uses less digits than its factorization.

51106209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221260.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 51106209 is about 7148.8606784578. The cubic root of 51106209 is about 371.1002288998.

It can be divided in two parts, 51106 and 209, that added together give a palindrome (51315).

The spelling of 51106209 in words is "fifty-one million, one hundred six thousand, two hundred nine".