1161331049 has 2 divisors, whose sum is σ = 1161331050. Its totient is φ = 1161331048.

The previous prime is 1161331001. The next prime is 1161331051. The reversal of 1161331049 is 9401331611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 680844649 + 480486400 = 26093^2 + 21920^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161331049 - 2¹⁶ = 1161265513 is a prime.

Together with 1161331051, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1161331069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580665524 + 580665525.

It is an arithmetic number, because the mean of its divisors is an integer number (580665525).

Almost surely, 2^1161331049 is an apocalyptic number.

It is an amenable number.

1161331049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161331049 is an equidigital number, since it uses as much as digits as its factorization.

1161331049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1161331049 is about 34078.3076017575. The cubic root of 1161331049 is about 1051.1193049555.

The spelling of 1161331049 in words is "one billion, one hundred sixty-one million, three hundred thirty-one thousand, forty-nine".