31142223 has 24 divisors (see below), whose sum is σ = 51556128. Its totient is φ = 17744832.

The previous prime is 31142219. The next prime is 31142227. The reversal of 31142223 is 32224113.

It is an interprime number because it is at equal distance from previous prime (31142219) and next prime (31142227).

It is not a de Polignac number, because 31142223 - 2² = 31142219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31142196 and 31142205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31142227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40761 + ... + 41517.

It is an arithmetic number, because the mean of its divisors is an integer number (2148172).

Almost surely, 2^31142223 is an apocalyptic number.

31142223 is a deficient number, since it is larger than the sum of its proper divisors (20413905).

31142223 is a wasteful number, since it uses less digits than its factorization.

31142223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423 (or 1420 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 31142223 is about 5580.5217498008. The cubic root of 31142223 is about 314.6177373578.

Adding to 31142223 its reverse (32224113), we get a palindrome (63366336).

The spelling of 31142223 in words is "thirty-one million, one hundred forty-two thousand, two hundred twenty-three".