51222722 has 4 divisors (see below), whose sum is σ = 76834086. Its totient is φ = 25611360.

The previous prime is 51222709. The next prime is 51222733. The reversal of 51222722 is 22722215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22722215 = 5 ⋅4544443.

It can be written as a sum of positive squares in only one way, i.e., 39450961 + 11771761 = 6281^2 + 3431^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12805679 + ... + 12805682.

Almost surely, 2^51222722 is an apocalyptic number.

51222722 is a deficient number, since it is larger than the sum of its proper divisors (25611364).

51222722 is a wasteful number, since it uses less digits than its factorization.

51222722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25611363.

The product of its digits is 1120, while the sum is 23.

The square root of 51222722 is about 7157.0050999004. The cubic root of 51222722 is about 371.3820288681.

Adding to 51222722 its reverse (22722215), we get a palindrome (73944937).

The spelling of 51222722 in words is "fifty-one million, two hundred twenty-two thousand, seven hundred twenty-two".