31423431 has 8 divisors (see below), whose sum is σ = 45120880. Its totient is φ = 19337472.

The previous prime is 31423421. The next prime is 31423433. The reversal of 31423431 is 13432413.

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

It is not a de Polignac number, because 31423431 - 2¹³ = 31415239 is a prime.

It is a super-2 number, since 2×31423431² = 1974864031623522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31423398 and 31423407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31423433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402826 + ... + 402903.

It is an arithmetic number, because the mean of its divisors is an integer number (5640110).

Almost surely, 2^31423431 is an apocalyptic number.

31423431 is a deficient number, since it is larger than the sum of its proper divisors (13697449).

31423431 is a wasteful number, since it uses less digits than its factorization.

31423431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805745.

The product of its digits is 864, while the sum is 21.

The square root of 31423431 is about 5605.6606211935. The cubic root of 31423431 is about 315.5618794928.

Adding to 31423431 its reverse (13432413), we get a palindrome (44855844).

The spelling of 31423431 in words is "thirty-one million, four hundred twenty-three thousand, four hundred thirty-one".