31404523 has 2 divisors, whose sum is σ = 31404524. Its totient is φ = 31404522.

The previous prime is 31404521. The next prime is 31404563. The reversal of 31404523 is 32540413.

It is a weak prime.

It is an emirp because it is prime and its reverse (32540413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31404523 - 2¹ = 31404521 is a prime.

Together with 31404521, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 31404494 and 31404503.

It is not a weakly prime, because it can be changed into another prime (31404521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702261 + 15702262.

It is an arithmetic number, because the mean of its divisors is an integer number (15702262).

Almost surely, 2^31404523 is an apocalyptic number.

31404523 is a deficient number, since it is larger than the sum of its proper divisors (1).

31404523 is an equidigital number, since it uses as much as digits as its factorization.

31404523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 31404523 is about 5603.9738578976. The cubic root of 31404523 is about 315.4985738535.

Adding to 31404523 its reverse (32540413), we get a palindrome (63944936).

The spelling of 31404523 in words is "thirty-one million, four hundred four thousand, five hundred twenty-three".