1161296989 has 2 divisors, whose sum is σ = 1161296990. Its totient is φ = 1161296988.

The previous prime is 1161296959. The next prime is 1161297029. The reversal of 1161296989 is 9896921611.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 806276025 + 355020964 = 28395^2 + 18842^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161296989 - 2⁵ = 1161296957 is a prime.

It is a super-2 number, since 2×1161296989² = 2697221393320932242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161296959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580648494 + 580648495.

It is an arithmetic number, because the mean of its divisors is an integer number (580648495).

Almost surely, 2^1161296989 is an apocalyptic number.

It is an amenable number.

1161296989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161296989 is an equidigital number, since it uses as much as digits as its factorization.

1161296989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 52.

The square root of 1161296989 is about 34077.8078667041. The cubic root of 1161296989 is about 1051.1090289670.

The spelling of 1161296989 in words is "one billion, one hundred sixty-one million, two hundred ninety-six thousand, nine hundred eighty-nine".