51121217 has 4 divisors (see below), whose sum is σ = 58424256. Its totient is φ = 43818180.

The previous prime is 51121163. The next prime is 51121237. The reversal of 51121217 is 71212115.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51121217 - 2¹⁶ = 51055681 is a prime.

It is a super-2 number, since 2×51121217² = 5226757655122178, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 51121217 parts by 10111 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51121237) 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, 3651509 + ... + 3651522.

It is an arithmetic number, because the mean of its divisors is an integer number (14606064).

Almost surely, 2^51121217 is an apocalyptic number.

It is an amenable number.

51121217 is a deficient number, since it is larger than the sum of its proper divisors (7303039).

51121217 is an equidigital number, since it uses as much as digits as its factorization.

51121217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7303038.

The product of its digits is 140, while the sum is 20.

The square root of 51121217 is about 7149.9102791574. The cubic root of 51121217 is about 371.1365514736.

The spelling of 51121217 in words is "fifty-one million, one hundred twenty-one thousand, two hundred seventeen".