31442313 has 8 divisors (see below), whose sum is σ = 47912128. Its totient is φ = 17967024.

The previous prime is 31442273. The next prime is 31442347. The reversal of 31442313 is 31324413.

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

It is not a de Polignac number, because 31442313 - 2¹⁴ = 31425929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1497253 = 31442313 / (3 + 1 + 4 + 4 + 2 + 3 + 1 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31442313.

It is not an unprimeable number, because it can be changed into a prime (31442353) 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, 748606 + ... + 748647.

It is an arithmetic number, because the mean of its divisors is an integer number (5989016).

Almost surely, 2^31442313 is an apocalyptic number.

It is an amenable number.

31442313 is a deficient number, since it is larger than the sum of its proper divisors (16469815).

31442313 is a wasteful number, since it uses less digits than its factorization.

31442313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497263.

The product of its digits is 864, while the sum is 21.

The square root of 31442313 is about 5607.3445587016. The cubic root of 31442313 is about 315.6250727445.

Adding to 31442313 its reverse (31324413), we get a palindrome (62766726).

The spelling of 31442313 in words is "thirty-one million, four hundred forty-two thousand, three hundred thirteen".