31006663 has 2 divisors, whose sum is σ = 31006664. Its totient is φ = 31006662.

The previous prime is 31006649. The next prime is 31006667. The reversal of 31006663 is 36660013.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31006663 is a prime.

It is a super-2 number, since 2×31006663² = 1922826300791138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31006667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15503331 + 15503332.

It is an arithmetic number, because the mean of its divisors is an integer number (15503332).

Almost surely, 2^31006663 is an apocalyptic number.

31006663 is a deficient number, since it is larger than the sum of its proper divisors (1).

31006663 is an equidigital number, since it uses as much as digits as its factorization.

31006663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 31006663 is about 5568.3626857452. The cubic root of 31006663 is about 314.1605700992.

Adding to 31006663 its reverse (36660013), we get a palindrome (67666676).

The spelling of 31006663 in words is "thirty-one million, six thousand, six hundred sixty-three".