31270081 has 2 divisors, whose sum is σ = 31270082. Its totient is φ = 31270080.

The previous prime is 31270049. The next prime is 31270097. The reversal of 31270081 is 18007213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28259856 + 3010225 = 5316^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 31270081 - 2⁵ = 31270049 is a prime.

It is a super-2 number, since 2×31270081² = 1955635931493122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31270781) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15635040 + 15635041.

It is an arithmetic number, because the mean of its divisors is an integer number (15635041).

Almost surely, 2^31270081 is an apocalyptic number.

It is an amenable number.

31270081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31270081 is an equidigital number, since it uses as much as digits as its factorization.

31270081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 31270081 is about 5591.9657545446. The cubic root of 31270081 is about 315.0477159597.

Adding to 31270081 its reverse (18007213), we get a palindrome (49277294).

The spelling of 31270081 in words is "thirty-one million, two hundred seventy thousand, eighty-one".