31866001 has 2 divisors, whose sum is σ = 31866002. Its totient is φ = 31866000.

The previous prime is 31865987. The next prime is 31866013. The reversal of 31866001 is 10066813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27667600 + 4198401 = 5260^2 + 2049^2 .

It is a cyclic number.

It is not a de Polignac number, because 31866001 - 2¹³ = 31857809 is a prime.

It is not a weakly prime, because it can be changed into another prime (31866101) 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, 15933000 + 15933001.

It is an arithmetic number, because the mean of its divisors is an integer number (15933001).

Almost surely, 2^31866001 is an apocalyptic number.

It is an amenable number.

31866001 is a deficient number, since it is larger than the sum of its proper divisors (1).

31866001 is an equidigital number, since it uses as much as digits as its factorization.

31866001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 31866001 is about 5644.9978742246. The cubic root of 31866001 is about 317.0364442438.

The spelling of 31866001 in words is "thirty-one million, eight hundred sixty-six thousand, one".