31431023 has 4 divisors (see below), whose sum is σ = 33848808. Its totient is φ = 29013240.

The previous prime is 31431017. The next prime is 31431031. The reversal of 31431023 is 32013413.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32013413 = 1451 ⋅22063.

It is a cyclic number.

It is not a de Polignac number, because 31431023 - 2¹⁰ = 31429999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31430992 and 31431010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31431013) 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, 1208873 + ... + 1208898.

It is an arithmetic number, because the mean of its divisors is an integer number (8462202).

Almost surely, 2^31431023 is an apocalyptic number.

31431023 is a deficient number, since it is larger than the sum of its proper divisors (2417785).

31431023 is a wasteful number, since it uses less digits than its factorization.

31431023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2417784.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 31431023 is about 5606.3377529364. The cubic root of 31431023 is about 315.5872910281.

Adding to 31431023 its reverse (32013413), we get a palindrome (63444436).

The spelling of 31431023 in words is "thirty-one million, four hundred thirty-one thousand, twenty-three".