1151988809 has 2 divisors, whose sum is σ = 1151988810. Its totient is φ = 1151988808.

The previous prime is 1151988797. The next prime is 1151988811. The reversal of 1151988809 is 9088891511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 602555209 + 549433600 = 24547^2 + 23440^2 .

It is a cyclic number.

It is not a de Polignac number, because 1151988809 - 2¹⁶ = 1151923273 is a prime.

It is a super-2 number, since 2×1151988809² = 2654156432122476962, which contains 22 as substring.

Together with 1151988811, 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 (1151988869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 575994404 + 575994405.

It is an arithmetic number, because the mean of its divisors is an integer number (575994405).

Almost surely, 2^1151988809 is an apocalyptic number.

It is an amenable number.

1151988809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1151988809 is an equidigital number, since it uses as much as digits as its factorization.

1151988809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 50.

The square root of 1151988809 is about 33940.9606375541. The cubic root of 1151988809 is about 1048.2931631451.

The spelling of 1151988809 in words is "one billion, one hundred fifty-one million, nine hundred eighty-eight thousand, eight hundred nine".