1161242813 has 2 divisors, whose sum is σ = 1161242814. Its totient is φ = 1161242812.

The previous prime is 1161242759. The next prime is 1161242827. The reversal of 1161242813 is 3182421611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1124797444 + 36445369 = 33538^2 + 6037^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161242813 - 2¹² = 1161238717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161241813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580621406 + 580621407.

It is an arithmetic number, because the mean of its divisors is an integer number (580621407).

Almost surely, 2^1161242813 is an apocalyptic number.

It is an amenable number.

1161242813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161242813 is an equidigital number, since it uses as much as digits as its factorization.

1161242813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 1161242813 is about 34077.0129706229. The cubic root of 1161242813 is about 1051.0926835162.

The spelling of 1161242813 in words is "one billion, one hundred sixty-one million, two hundred forty-two thousand, eight hundred thirteen".