31036661 has 2 divisors, whose sum is σ = 31036662. Its totient is φ = 31036660.

The previous prime is 31036639. The next prime is 31036711. The reversal of 31036661 is 16663013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28026436 + 3010225 = 5294^2 + 1735^2 .

It is an emirp because it is prime and its reverse (16663013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31036661 - 2¹⁸ = 30774517 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31036661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31036261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15518330 + 15518331.

It is an arithmetic number, because the mean of its divisors is an integer number (15518331).

Almost surely, 2^31036661 is an apocalyptic number.

It is an amenable number.

31036661 is a deficient number, since it is larger than the sum of its proper divisors (1).

31036661 is an equidigital number, since it uses as much as digits as its factorization.

31036661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 31036661 is about 5571.0556450281. The cubic root of 31036661 is about 314.2618510315.

Adding to 31036661 its reverse (16663013), we get a palindrome (47699674).

The spelling of 31036661 in words is "thirty-one million, thirty-six thousand, six hundred sixty-one".