31010081 has 2 divisors, whose sum is σ = 31010082. Its totient is φ = 31010080.

The previous prime is 31010053. The next prime is 31010093. The reversal of 31010081 is 18001013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29333056 + 1677025 = 5416^2 + 1295^2 .

It is a cyclic number.

It is not a de Polignac number, because 31010081 - 2⁶ = 31010017 is a prime.

It is a super-2 number, since 2×31010081² = 1923250247253122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31010041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15505040 + 15505041.

It is an arithmetic number, because the mean of its divisors is an integer number (15505041).

Almost surely, 2^31010081 is an apocalyptic number.

It is an amenable number.

31010081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31010081 is an equidigital number, since it uses as much as digits as its factorization.

31010081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 31010081 is about 5568.6695897674. The cubic root of 31010081 is about 314.1721134394.

Adding to 31010081 its reverse (18001013), we get a palindrome (49011094).

The spelling of 31010081 in words is "thirty-one million, ten thousand, eighty-one".