1155911359409 has 2 divisors, whose sum is σ = 1155911359410. Its totient is φ = 1155911359408.

The previous prime is 1155911359321. The next prime is 1155911359457. The reversal of 1155911359409 is 9049531195511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599932349809 + 555979009600 = 774553^2 + 745640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1155911359409 is a prime.

It is a super-3 number, since 3×1155911359409³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1155911350409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577955679704 + 577955679705.

It is an arithmetic number, because the mean of its divisors is an integer number (577955679705).

Almost surely, 2^{1155911359409} is an apocalyptic number.

It is an amenable number.

1155911359409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155911359409 is an equidigital number, since it uses as much as digits as its factorization.

1155911359409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1093500, while the sum is 53.

The spelling of 1155911359409 in words is "one trillion, one hundred fifty-five billion, nine hundred eleven million, three hundred fifty-nine thousand, four hundred nine".