31345403 has 2 divisors, whose sum is σ = 31345404. Its totient is φ = 31345402.

The previous prime is 31345373. The next prime is 31345417. The reversal of 31345403 is 30454313.

It is a strong prime.

It is an emirp because it is prime and its reverse (30454313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31345403 - 2⁶ = 31345339 is a prime.

It is not a weakly prime, because it can be changed into another prime (31345703) 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, 15672701 + 15672702.

It is an arithmetic number, because the mean of its divisors is an integer number (15672702).

Almost surely, 2^31345403 is an apocalyptic number.

31345403 is a deficient number, since it is larger than the sum of its proper divisors (1).

31345403 is an equidigital number, since it uses as much as digits as its factorization.

31345403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 31345403 is about 5598.6965447325. The cubic root of 31345403 is about 315.3004708346.

Adding to 31345403 its reverse (30454313), we get a palindrome (61799716).

The spelling of 31345403 in words is "thirty-one million, three hundred forty-five thousand, four hundred three".