51222215 has 8 divisors (see below), whose sum is σ = 67054608. Its totient is φ = 37252480.

The previous prime is 51222211. The next prime is 51222247.

It is a happy number.

51222215 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 51222215 - 2² = 51222211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51222211) 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, 465602 + ... + 465711.

It is an arithmetic number, because the mean of its divisors is an integer number (8381826).

Almost surely, 2^51222215 is an apocalyptic number.

51222215 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51222215 is a deficient number, since it is larger than the sum of its proper divisors (15832393).

51222215 is a wasteful number, since it uses less digits than its factorization.

51222215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931329.

The product of its digits is 400, while the sum is 20.

The square root of 51222215 is about 7156.9696799693. The cubic root of 51222215 is about 371.3808035570.

It can be divided in two parts, 5122 and 2215, that added together give a palindrome (7337).

The spelling of 51222215 in words is "fifty-one million, two hundred twenty-two thousand, two hundred fifteen".