1159193921 has 2 divisors, whose sum is σ = 1159193922. Its totient is φ = 1159193920.

The previous prime is 1159193879. The next prime is 1159193923. The reversal of 1159193921 is 1293919511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1153553296 + 5640625 = 33964^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 1159193921 - 2¹⁰ = 1159192897 is a prime.

Together with 1159193923, 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 (1159193923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 579596960 + 579596961.

It is an arithmetic number, because the mean of its divisors is an integer number (579596961).

Almost surely, 2^1159193921 is an apocalyptic number.

It is an amenable number.

1159193921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1159193921 is an equidigital number, since it uses as much as digits as its factorization.

1159193921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21870, while the sum is 41.

The square root of 1159193921 is about 34046.9370281675. The cubic root of 1159193921 is about 1050.4741383978.

The spelling of 1159193921 in words is "one billion, one hundred fifty-nine million, one hundred ninety-three thousand, nine hundred twenty-one".