1161305869 has 2 divisors, whose sum is σ = 1161305870. Its totient is φ = 1161305868.

The previous prime is 1161305867. The next prime is 1161305881. The reversal of 1161305869 is 9685031611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1129833769 + 31472100 = 33613^2 + 5610^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161305869 - 2¹ = 1161305867 is a prime.

It is a super-2 number, since 2×1161305869² = 2697262642747690322, which contains 22 as substring.

Together with 1161305867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161305867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580652934 + 580652935.

It is an arithmetic number, because the mean of its divisors is an integer number (580652935).

Almost surely, 2^1161305869 is an apocalyptic number.

It is an amenable number.

1161305869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161305869 is an equidigital number, since it uses as much as digits as its factorization.

1161305869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 1161305869 is about 34077.9381565258. The cubic root of 1161305869 is about 1051.1117081049. Note that the first 3 decimals are identical.

The spelling of 1161305869 in words is "one billion, one hundred sixty-one million, three hundred five thousand, eight hundred sixty-nine".