1031231189 has 2 divisors, whose sum is σ = 1031231190. Its totient is φ = 1031231188.

The previous prime is 1031231171. The next prime is 1031231207. The reversal of 1031231189 is 9811321301.

It is a balanced prime because it is at equal distance from previous prime (1031231171) and next prime (1031231207).

It can be written as a sum of positive squares in only one way, i.e., 986902225 + 44328964 = 31415^2 + 6658^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031231189 - 2⁸ = 1031230933 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1031231119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515615594 + 515615595.

It is an arithmetic number, because the mean of its divisors is an integer number (515615595).

Almost surely, 2^1031231189 is an apocalyptic number.

It is an amenable number.

1031231189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031231189 is an equidigital number, since it uses as much as digits as its factorization.

1031231189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1031231189 is about 32112.7885584544. The cubic root of 1031231189 is about 1010.3038621068.

The spelling of 1031231189 in words is "one billion, thirty-one million, two hundred thirty-one thousand, one hundred eighty-nine".