31663417 has 2 divisors, whose sum is σ = 31663418. Its totient is φ = 31663416.

The previous prime is 31663409. The next prime is 31663559. The reversal of 31663417 is 71436613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27415696 + 4247721 = 5236^2 + 2061^2 .

It is an emirp because it is prime and its reverse (71436613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31663417 - 2³ = 31663409 is a prime.

It is a super-2 number, since 2×31663417² = 2005143952231778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31663717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15831708 + 15831709.

It is an arithmetic number, because the mean of its divisors is an integer number (15831709).

Almost surely, 2^31663417 is an apocalyptic number.

It is an amenable number.

31663417 is a deficient number, since it is larger than the sum of its proper divisors (1).

31663417 is an equidigital number, since it uses as much as digits as its factorization.

31663417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 31.

The square root of 31663417 is about 5627.0255908428. The cubic root of 31663417 is about 316.3631760198.

The spelling of 31663417 in words is "thirty-one million, six hundred sixty-three thousand, four hundred seventeen".