31202081 has 2 divisors, whose sum is σ = 31202082. Its totient is φ = 31202080.

The previous prime is 31202051. The next prime is 31202131. The reversal of 31202081 is 18020213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31181056 + 21025 = 5584^2 + 145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31202081 is a prime.

It is a super-2 number, since 2×31202081² = 1947139717461122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31202051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15601040 + 15601041.

It is an arithmetic number, because the mean of its divisors is an integer number (15601041).

Almost surely, 2^31202081 is an apocalyptic number.

It is an amenable number.

31202081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31202081 is an equidigital number, since it uses as much as digits as its factorization.

31202081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 31202081 is about 5585.8822937831. The cubic root of 31202081 is about 314.8191823604.

Adding to 31202081 its reverse (18020213), we get a palindrome (49222294).

The spelling of 31202081 in words is "thirty-one million, two hundred two thousand, eighty-one".