51113217 has 8 divisors (see below), whose sum is σ = 68215840. Its totient is φ = 34043040.

The previous prime is 51113207. The next prime is 51113221. The reversal of 51113217 is 71231115.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51113217 - 2⁷ = 51113089 is a prime.

It is a super-2 number, since 2×51113217² = 5225121904178178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51113193 and 51113202.

It is not an unprimeable number, because it can be changed into a prime (51113207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4159 + ... + 10932.

It is an arithmetic number, because the mean of its divisors is an integer number (8526980).

Almost surely, 2^51113217 is an apocalyptic number.

It is an amenable number.

51113217 is a deficient number, since it is larger than the sum of its proper divisors (17102623).

51113217 is a wasteful number, since it uses less digits than its factorization.

51113217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16223.

The product of its digits is 210, while the sum is 21.

The square root of 51113217 is about 7149.3508096889. The cubic root of 51113217 is about 371.1171906453.

The spelling of 51113217 in words is "fifty-one million, one hundred thirteen thousand, two hundred seventeen".