31170423 has 4 divisors (see below), whose sum is σ = 41560568. Its totient is φ = 20780280.

The previous prime is 31170421. The next prime is 31170427. The reversal of 31170423 is 32407113.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31170423 - 2¹ = 31170421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31170423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31170421) 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 3 ways as a sum of consecutive naturals, for example, 5195068 + ... + 5195073.

It is an arithmetic number, because the mean of its divisors is an integer number (10390142).

Almost surely, 2^31170423 is an apocalyptic number.

31170423 is a deficient number, since it is larger than the sum of its proper divisors (10390145).

31170423 is a wasteful number, since it uses less digits than its factorization.

31170423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10390144.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 31170423 is about 5583.0478235458. The cubic root of 31170423 is about 314.7126732432.

Adding to 31170423 its reverse (32407113), we get a palindrome (63577536).

The spelling of 31170423 in words is "thirty-one million, one hundred seventy thousand, four hundred twenty-three".