31442243 has 4 divisors (see below), whose sum is σ = 35934000. Its totient is φ = 26950488.

The previous prime is 31442239. The next prime is 31442261. The reversal of 31442243 is 34224413.

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

It is a cyclic number.

It is not a de Polignac number, because 31442243 - 2² = 31442239 is a prime.

It is a super-2 number, since 2×31442243² = 1977229289742098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31442263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2245868 + ... + 2245881.

It is an arithmetic number, because the mean of its divisors is an integer number (8983500).

Almost surely, 2^31442243 is an apocalyptic number.

31442243 is a deficient number, since it is larger than the sum of its proper divisors (4491757).

31442243 is an equidigital number, since it uses as much as digits as its factorization.

31442243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4491756.

The product of its digits is 2304, while the sum is 23.

The square root of 31442243 is about 5607.3383168844. The cubic root of 31442243 is about 315.6248385190.

Adding to 31442243 its reverse (34224413), we get a palindrome (65666656).

The spelling of 31442243 in words is "thirty-one million, four hundred forty-two thousand, two hundred forty-three".