31216103 has 2 divisors, whose sum is σ = 31216104. Its totient is φ = 31216102.

The previous prime is 31216061. The next prime is 31216109. The reversal of 31216103 is 30161213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31216103 - 2¹⁴ = 31199719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31216109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15608051 + 15608052.

It is an arithmetic number, because the mean of its divisors is an integer number (15608052).

Almost surely, 2^31216103 is an apocalyptic number.

31216103 is a deficient number, since it is larger than the sum of its proper divisors (1).

31216103 is an equidigital number, since it uses as much as digits as its factorization.

31216103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 31216103 is about 5587.1372812917. The cubic root of 31216103 is about 314.8663344875.

Adding to 31216103 its reverse (30161213), we get a palindrome (61377316).

The spelling of 31216103 in words is "thirty-one million, two hundred sixteen thousand, one hundred three".