31661017 has 2 divisors, whose sum is σ = 31661018. Its totient is φ = 31661016.

The previous prime is 31660999. The next prime is 31661023. The reversal of 31661017 is 71016613.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28344976 + 3316041 = 5324^2 + 1821^2 .

It is an emirp because it is prime and its reverse (71016613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31661017 - 2¹¹ = 31658969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31660982 and 31661000.

It is not a weakly prime, because it can be changed into another prime (31661057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15830508 + 15830509.

It is an arithmetic number, because the mean of its divisors is an integer number (15830509).

Almost surely, 2^31661017 is an apocalyptic number.

It is an amenable number.

31661017 is a deficient number, since it is larger than the sum of its proper divisors (1).

31661017 is an equidigital number, since it uses as much as digits as its factorization.

31661017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 31661017 is about 5626.8123302630. The cubic root of 31661017 is about 316.3551826647.

The spelling of 31661017 in words is "thirty-one million, six hundred sixty-one thousand, seventeen".