31225442 has 4 divisors (see below), whose sum is σ = 46838166. Its totient is φ = 15612720.

The previous prime is 31225429. The next prime is 31225457. The reversal of 31225442 is 24452213.

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: 24452213 = 227 ⋅107719.

It can be written as a sum of positive squares in only one way, i.e., 26512201 + 4713241 = 5149^2 + 2171^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7806359 + ... + 7806362.

Almost surely, 2^31225442 is an apocalyptic number.

31225442 is a deficient number, since it is larger than the sum of its proper divisors (15612724).

31225442 is a wasteful number, since it uses less digits than its factorization.

31225442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15612723.

The product of its digits is 1920, while the sum is 23.

The square root of 31225442 is about 5587.9729777443. The cubic root of 31225442 is about 314.8977311410.

Adding to 31225442 its reverse (24452213), we get a palindrome (55677655).

The spelling of 31225442 in words is "thirty-one million, two hundred twenty-five thousand, four hundred forty-two".