31662101 has 2 divisors, whose sum is σ = 31662102. Its totient is φ = 31662100.

The previous prime is 31662091. The next prime is 31662131. The reversal of 31662101 is 10126613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21613201 + 10048900 = 4649^2 + 3170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31662101 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 (31662131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15831050 + 15831051.

It is an arithmetic number, because the mean of its divisors is an integer number (15831051).

Almost surely, 2^31662101 is an apocalyptic number.

It is an amenable number.

31662101 is a deficient number, since it is larger than the sum of its proper divisors (1).

31662101 is an equidigital number, since it uses as much as digits as its factorization.

31662101 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 20.

The square root of 31662101 is about 5626.9086539591. The cubic root of 31662101 is about 316.3587930468.

Adding to 31662101 its reverse (10126613), we get a palindrome (41788714).

The spelling of 31662101 in words is "thirty-one million, six hundred sixty-two thousand, one hundred one".