31999103 has 2 divisors, whose sum is σ = 31999104. Its totient is φ = 31999102.

The previous prime is 31999087. The next prime is 31999109. The reversal of 31999103 is 30199913.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31999103 - 2⁴ = 31999087 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31999109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15999551 + 15999552.

It is an arithmetic number, because the mean of its divisors is an integer number (15999552).

Almost surely, 2^31999103 is an apocalyptic number.

31999103 is a deficient number, since it is larger than the sum of its proper divisors (1).

31999103 is an equidigital number, since it uses as much as digits as its factorization.

31999103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 31999103 is about 5656.7749645889. The cubic root of 31999103 is about 317.4772439102.

It can be divided in two parts, 3199910 and 3, that added together give a palindrome (3199913).

The spelling of 31999103 in words is "thirty-one million, nine hundred ninety-nine thousand, one hundred three".