31980101 has 2 divisors, whose sum is σ = 31980102. Its totient is φ = 31980100.

The previous prime is 31980083. The next prime is 31980121. The reversal of 31980101 is 10108913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27984100 + 3996001 = 5290^2 + 1999^2 .

It is a cyclic number.

It is not a de Polignac number, because 31980101 - 2⁶ = 31980037 is a prime.

It is a Sophie Germain prime.

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 (31980121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15990050 + 15990051.

It is an arithmetic number, because the mean of its divisors is an integer number (15990051).

Almost surely, 2^31980101 is an apocalyptic number.

It is an amenable number.

31980101 is a deficient number, since it is larger than the sum of its proper divisors (1).

31980101 is an equidigital number, since it uses as much as digits as its factorization.

31980101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 31980101 is about 5655.0951362466. The cubic root of 31980101 is about 317.4143890534.

The spelling of 31980101 in words is "thirty-one million, nine hundred eighty thousand, one hundred one".