31230403 has 2 divisors, whose sum is σ = 31230404. Its totient is φ = 31230402.

The previous prime is 31230401. The next prime is 31230413. The reversal of 31230403 is 30403213.

It is a weak prime.

It is an emirp because it is prime and its reverse (30403213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31230403 - 2¹ = 31230401 is a prime.

Together with 31230401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31230401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615201 + 15615202.

It is an arithmetic number, because the mean of its divisors is an integer number (15615202).

Almost surely, 2^31230403 is an apocalyptic number.

31230403 is a deficient number, since it is larger than the sum of its proper divisors (1).

31230403 is an equidigital number, since it uses as much as digits as its factorization.

31230403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 31230403 is about 5588.4168598987. The cubic root of 31230403 is about 314.9144069115.

Adding to 31230403 its reverse (30403213), we get a palindrome (61633616).

The spelling of 31230403 in words is "thirty-one million, two hundred thirty thousand, four hundred three".