9031609861 has 2 divisors, whose sum is σ = 9031609862. Its totient is φ = 9031609860.

The previous prime is 9031609823. The next prime is 9031609871. The reversal of 9031609861 is 1689061309.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7326332836 + 1705277025 = 85594^2 + 41295^2 .

It is a cyclic number.

It is not a de Polignac number, because 9031609861 - 2³¹ = 6884126213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9031609871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4515804930 + 4515804931.

It is an arithmetic number, because the mean of its divisors is an integer number (4515804931).

Almost surely, 2^9031609861 is an apocalyptic number.

It is an amenable number.

9031609861 is a deficient number, since it is larger than the sum of its proper divisors (1).

9031609861 is an equidigital number, since it uses as much as digits as its factorization.

9031609861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 9031609861 is about 95034.7823746653. The cubic root of 9031609861 is about 2082.5162057608.

The spelling of 9031609861 in words is "nine billion, thirty-one million, six hundred nine thousand, eight hundred sixty-one".