31222274 has 4 divisors (see below), whose sum is σ = 46833414. Its totient is φ = 15611136.

The previous prime is 31222271. The next prime is 31222327. The reversal of 31222274 is 47222213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47222213 = 43 ⋅1098191.

It can be written as a sum of positive squares in only one way, i.e., 27825625 + 3396649 = 5275^2 + 1843^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31222271) by changing a digit.

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, 7805567 + ... + 7805570.

Almost surely, 2^31222274 is an apocalyptic number.

31222274 is a deficient number, since it is larger than the sum of its proper divisors (15611140).

31222274 is a wasteful number, since it uses less digits than its factorization.

31222274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15611139.

The product of its digits is 1344, while the sum is 23.

The square root of 31222274 is about 5587.6895046164. The cubic root of 31222274 is about 314.8870813878.

Adding to 31222274 its reverse (47222213), we get a palindrome (78444487).

The spelling of 31222274 in words is "thirty-one million, two hundred twenty-two thousand, two hundred seventy-four".