31320442 has 4 divisors (see below), whose sum is σ = 46980666. Its totient is φ = 15660220.

The previous prime is 31320413. The next prime is 31320451. The reversal of 31320442 is 24402313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 31236921 + 83521 = 5589^2 + 289^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7830109 + ... + 7830112.

Almost surely, 2^31320442 is an apocalyptic number.

31320442 is a deficient number, since it is larger than the sum of its proper divisors (15660224).

31320442 is a wasteful number, since it uses less digits than its factorization.

31320442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15660223.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 31320442 is about 5596.4669211923. The cubic root of 31320442 is about 315.2167551560.

Adding to 31320442 its reverse (24402313), we get a palindrome (55722755).

The spelling of 31320442 in words is "thirty-one million, three hundred twenty thousand, four hundred forty-two".