1161043861 has 2 divisors, whose sum is σ = 1161043862. Its totient is φ = 1161043860.

The previous prime is 1161043853. The next prime is 1161043879. The reversal of 1161043861 is 1683401611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1143454225 + 17589636 = 33815^2 + 4194^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161043861 - 2³ = 1161043853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161043801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580521930 + 580521931.

It is an arithmetic number, because the mean of its divisors is an integer number (580521931).

Almost surely, 2^1161043861 is an apocalyptic number.

It is an amenable number.

1161043861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161043861 is an equidigital number, since it uses as much as digits as its factorization.

1161043861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1161043861 is about 34074.0936930096. The cubic root of 1161043861 is about 1051.0326533104.

The spelling of 1161043861 in words is "one billion, one hundred sixty-one million, forty-three thousand, eight hundred sixty-one".