31676861 has 2 divisors, whose sum is σ = 31676862. Its totient is φ = 31676860.

The previous prime is 31676851. The next prime is 31676891. The reversal of 31676861 is 16867613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22562500 + 9114361 = 4750^2 + 3019^2 .

It is a cyclic number.

It is not a de Polignac number, because 31676861 - 2¹⁰ = 31675837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31676851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15838430 + 15838431.

It is an arithmetic number, because the mean of its divisors is an integer number (15838431).

Almost surely, 2^31676861 is an apocalyptic number.

It is an amenable number.

31676861 is a deficient number, since it is larger than the sum of its proper divisors (1).

31676861 is an equidigital number, since it uses as much as digits as its factorization.

31676861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 31676861 is about 5628.2200561101. The cubic root of 31676861 is about 316.4079446638.

It can be divided in two parts, 316 and 76861, that added together give a palindrome (77177).

The spelling of 31676861 in words is "thirty-one million, six hundred seventy-six thousand, eight hundred sixty-one".