31240223 has 4 divisors (see below), whose sum is σ = 35703120. Its totient is φ = 26777328.

The previous prime is 31240211. The next prime is 31240229. The reversal of 31240223 is 32204213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32204213 = 677 ⋅47569.

It is a cyclic number.

It is not a de Polignac number, because 31240223 - 2⁴ = 31240207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240229) 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, 2231438 + ... + 2231451.

It is an arithmetic number, because the mean of its divisors is an integer number (8925780).

Almost surely, 2^31240223 is an apocalyptic number.

31240223 is a deficient number, since it is larger than the sum of its proper divisors (4462897).

31240223 is an equidigital number, since it uses as much as digits as its factorization.

31240223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4462896.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 31240223 is about 5589.2953938757. The cubic root of 31240223 is about 314.9474103858.

Adding to 31240223 its reverse (32204213), we get a palindrome (63444436).

The spelling of 31240223 in words is "thirty-one million, two hundred forty thousand, two hundred twenty-three".