31421423 has 8 divisors (see below), whose sum is σ = 36294480. Its totient is φ = 26884480.

The previous prime is 31421417. The next prime is 31421431. The reversal of 31421423 is 32412413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31421423 - 2¹² = 31417327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31421395 and 31421404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31421623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83828 + ... + 84201.

It is an arithmetic number, because the mean of its divisors is an integer number (4536810).

Almost surely, 2^31421423 is an apocalyptic number.

31421423 is a deficient number, since it is larger than the sum of its proper divisors (4873057).

31421423 is a wasteful number, since it uses less digits than its factorization.

31421423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168057.

The product of its digits is 576, while the sum is 20.

The square root of 31421423 is about 5605.4815136614. The cubic root of 31421423 is about 315.5551577384. Note that the first 3 decimals are identical.

Adding to 31421423 its reverse (32412413), we get a palindrome (63833836).

The spelling of 31421423 in words is "thirty-one million, four hundred twenty-one thousand, four hundred twenty-three".