31010561 has 2 divisors, whose sum is σ = 31010562. Its totient is φ = 31010560.

The previous prime is 31010531. The next prime is 31010579. The reversal of 31010561 is 16501013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28890625 + 2119936 = 5375^2 + 1456^2 .

It is a cyclic number.

It is not a de Polignac number, because 31010561 - 2¹⁴ = 30994177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31010501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15505280 + 15505281.

It is an arithmetic number, because the mean of its divisors is an integer number (15505281).

Almost surely, 2^31010561 is an apocalyptic number.

It is an amenable number.

31010561 is a deficient number, since it is larger than the sum of its proper divisors (1).

31010561 is an equidigital number, since it uses as much as digits as its factorization.

31010561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 31010561 is about 5568.7126878660. The cubic root of 31010561 is about 314.1737344373.

Adding to 31010561 its reverse (16501013), we get a palindrome (47511574).

The spelling of 31010561 in words is "thirty-one million, ten thousand, five hundred sixty-one".