1155312409 has 4 divisors (see below), whose sum is σ = 1155741904. Its totient is φ = 1154882916.

The previous prime is 1155312407. The next prime is 1155312427. The reversal of 1155312409 is 9042135511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1155312409 - 2¹ = 1155312407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155312407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210687 + ... + 216100.

It is an arithmetic number, because the mean of its divisors is an integer number (288935476).

Almost surely, 2^1155312409 is an apocalyptic number.

It is an amenable number.

1155312409 is a deficient number, since it is larger than the sum of its proper divisors (429495).

1155312409 is an equidigital number, since it uses as much as digits as its factorization.

1155312409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429494.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1155312409 is about 33989.8868635952. The cubic root of 1155312409 is about 1049.3003378177.

The spelling of 1155312409 in words is "one billion, one hundred fifty-five million, three hundred twelve thousand, four hundred nine".