31123422 has 24 divisors (see below), whose sum is σ = 73564920. Its totient is φ = 9431280.

The previous prime is 31123403. The next prime is 31123427. The reversal of 31123422 is 22432113.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31123395 and 31123404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78397 + ... + 78792.

It is an arithmetic number, because the mean of its divisors is an integer number (3065205).

Almost surely, 2^31123422 is an apocalyptic number.

31123422 is an abundant number, since it is smaller than the sum of its proper divisors (42441498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31123422 is a wasteful number, since it uses less digits than its factorization.

31123422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157208 (or 157205 counting only the distinct ones).

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

The square root of 31123422 is about 5578.8369755712. The cubic root of 31123422 is about 314.5544115549.

Adding to 31123422 its reverse (22432113), we get a palindrome (53555535).

The spelling of 31123422 in words is "thirty-one million, one hundred twenty-three thousand, four hundred twenty-two".