31118663 has 2 divisors, whose sum is σ = 31118664. Its totient is φ = 31118662.

The previous prime is 31118641. The next prime is 31118671. The reversal of 31118663 is 36681113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31118663 - 2¹⁸ = 30856519 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31118603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15559331 + 15559332.

It is an arithmetic number, because the mean of its divisors is an integer number (15559332).

Almost surely, 2^31118663 is an apocalyptic number.

31118663 is a deficient number, since it is larger than the sum of its proper divisors (1).

31118663 is an equidigital number, since it uses as much as digits as its factorization.

31118663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 31118663 is about 5578.4104366746. The cubic root of 31118663 is about 314.5383781771.

Adding to 31118663 its reverse (36681113), we get a palindrome (67799776).

The spelling of 31118663 in words is "thirty-one million, one hundred eighteen thousand, six hundred sixty-three".