1163143561 has 2 divisors, whose sum is σ = 1163143562. Its totient is φ = 1163143560.

The previous prime is 1163143481. The next prime is 1163143589. The reversal of 1163143561 is 1653413611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 746983561 + 416160000 = 27331^2 + 20400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1163143561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1163144561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 581571780 + 581571781.

It is an arithmetic number, because the mean of its divisors is an integer number (581571781).

Almost surely, 2^1163143561 is an apocalyptic number.

It is an amenable number.

1163143561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1163143561 is an equidigital number, since it uses as much as digits as its factorization.

1163143561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 1163143561 is about 34104.8905730542. The cubic root of 1163143561 is about 1051.6658548448.

The spelling of 1163143561 in words is "one billion, one hundred sixty-three million, one hundred forty-three thousand, five hundred sixty-one".