31866101 has 2 divisors, whose sum is σ = 31866102. Its totient is φ = 31866100.

The previous prime is 31866073. The next prime is 31866103. The reversal of 31866101 is 10166813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28622500 + 3243601 = 5350^2 + 1801^2 .

It is an emirp because it is prime and its reverse (10166813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31866101 - 2²² = 27671797 is a prime.

It is a Sophie Germain prime.

Together with 31866103, it forms a pair of twin primes.

It is a Chen 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 (31866103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15933050 + 15933051.

It is an arithmetic number, because the mean of its divisors is an integer number (15933051).

Almost surely, 2^31866101 is an apocalyptic number.

It is an amenable number.

31866101 is a deficient number, since it is larger than the sum of its proper divisors (1).

31866101 is an equidigital number, since it uses as much as digits as its factorization.

31866101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 31866101 is about 5645.0067316169. The cubic root of 31866101 is about 317.0367758785.

The spelling of 31866101 in words is "thirty-one million, eight hundred sixty-six thousand, one hundred one".