1031091161 has 2 divisors, whose sum is σ = 1031091162. Its totient is φ = 1031091160.

The previous prime is 1031091151. The next prime is 1031091163. The reversal of 1031091161 is 1611901301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 777294400 + 253796761 = 27880^2 + 15931^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031091161 - 2¹⁴ = 1031074777 is a prime.

Together with 1031091163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1031091163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515545580 + 515545581.

It is an arithmetic number, because the mean of its divisors is an integer number (515545581).

Almost surely, 2^1031091161 is an apocalyptic number.

It is an amenable number.

1031091161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031091161 is an equidigital number, since it uses as much as digits as its factorization.

1031091161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 1031091161 is about 32110.6082315487. The cubic root of 1031091161 is about 1010.2581312579.

Adding to 1031091161 its reverse (1611901301), we get a palindrome (2642992462).

The spelling of 1031091161 in words is "one billion, thirty-one million, ninety-one thousand, one hundred sixty-one".