31131423 has 24 divisors (see below), whose sum is σ = 46388160. Its totient is φ = 20106240.

The previous prime is 31131421. The next prime is 31131431. The reversal of 31131423 is 32413113.

It is not a de Polignac number, because 31131423 - 2¹ = 31131421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31131396 and 31131405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131421) 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, 88015 + ... + 88367.

It is an arithmetic number, because the mean of its divisors is an integer number (1932840).

Almost surely, 2^31131423 is an apocalyptic number.

31131423 is a deficient number, since it is larger than the sum of its proper divisors (15256737).

31131423 is a wasteful number, since it uses less digits than its factorization.

31131423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 636 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 31131423 is about 5579.5540144352. The cubic root of 31131423 is about 314.5813637563.

Adding to 31131423 its reverse (32413113), we get a palindrome (63544536).

The spelling of 31131423 in words is "thirty-one million, one hundred thirty-one thousand, four hundred twenty-three".