1159509721 has 2 divisors, whose sum is σ = 1159509722. Its totient is φ = 1159509720.

The previous prime is 1159509719. The next prime is 1159509739. The reversal of 1159509721 is 1279059511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1148193225 + 11316496 = 33885^2 + 3364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1159509721 - 2¹ = 1159509719 is a prime.

Together with 1159509719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1159503721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 579754860 + 579754861.

It is an arithmetic number, because the mean of its divisors is an integer number (579754861).

Almost surely, 2^1159509721 is an apocalyptic number.

It is an amenable number.

1159509721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1159509721 is an equidigital number, since it uses as much as digits as its factorization.

1159509721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 40.

The square root of 1159509721 is about 34051.5744276238. The cubic root of 1159509721 is about 1050.5695235346.

The spelling of 1159509721 in words is "one billion, one hundred fifty-nine million, five hundred nine thousand, seven hundred twenty-one".