1155813973 has 4 divisors (see below), whose sum is σ = 1155948768. Its totient is φ = 1155679180.

The previous prime is 1155813961. The next prime is 1155814007. The reversal of 1155813973 is 3793185511.

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 a de Polignac number, because none of the positive numbers 2^k-1155813973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155813913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53593 + ... + 71998.

It is an arithmetic number, because the mean of its divisors is an integer number (288987192).

Almost surely, 2^1155813973 is an apocalyptic number.

It is an amenable number.

1155813973 is a deficient number, since it is larger than the sum of its proper divisors (134795).

1155813973 is an equidigital number, since it uses as much as digits as its factorization.

1155813973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134794.

The product of its digits is 113400, while the sum is 43.

The square root of 1155813973 is about 33997.2641987558. The cubic root of 1155813973 is about 1049.4521625905.

The spelling of 1155813973 in words is "one billion, one hundred fifty-five million, eight hundred thirteen thousand, nine hundred seventy-three".