1161326641 has 2 divisors, whose sum is σ = 1161326642. Its totient is φ = 1161326640.

The previous prime is 1161326629. The next prime is 1161326701. The reversal of 1161326641 is 1466231611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 926593600 + 234733041 = 30440^2 + 15321^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161326641 - 2⁵ = 1161326609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1161326041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580663320 + 580663321.

It is an arithmetic number, because the mean of its divisors is an integer number (580663321).

Almost surely, 2^1161326641 is an apocalyptic number.

It is an amenable number.

1161326641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161326641 is an equidigital number, since it uses as much as digits as its factorization.

1161326641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 31.

The square root of 1161326641 is about 34078.2429271229. The cubic root of 1161326641 is about 1051.1179750620.

The spelling of 1161326641 in words is "one billion, one hundred sixty-one million, three hundred twenty-six thousand, six hundred forty-one".