1155599999 has 2 divisors, whose sum is σ = 1155600000. Its totient is φ = 1155599998.

The previous prime is 1155599993. The next prime is 1155600029. The reversal of 1155599999 is 9999955511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1155599999 - 2²⁸ = 887164543 is a prime.

It is a super-2 number, since 2×1155599999² = 2670822715377600002, which contains 22 as substring.

It is a Sophie Germain prime.

1155599999 is a modest number, since divided by 99999 gives 11555 as remainder.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155599993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577799999 + 577800000.

It is an arithmetic number, because the mean of its divisors is an integer number (577800000).

Almost surely, 2^1155599999 is an apocalyptic number.

1155599999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155599999 is an equidigital number, since it uses as much as digits as its factorization.

1155599999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7381125, while the sum is 62.

The square root of 1155599999 is about 33994.1171234083. The cubic root of 1155599999 is about 1049.3873974579.

The spelling of 1155599999 in words is "one billion, one hundred fifty-five million, five hundred ninety-nine thousand, nine hundred ninety-nine".