1155559971 has 4 divisors (see below), whose sum is σ = 1540746632. Its totient is φ = 770373312.

The previous prime is 1155559969. The next prime is 1155560011. The reversal of 1155559971 is 1799555511.

1155559971 is nontrivially palindromic in base 11.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1155559971 - 2¹ = 1155559969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1155559971.

It is not an unprimeable number, because it can be changed into a prime (1155559961) 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, 192593326 + ... + 192593331.

It is an arithmetic number, because the mean of its divisors is an integer number (385186658).

Almost surely, 2^1155559971 is an apocalyptic number.

1155559971 is a deficient number, since it is larger than the sum of its proper divisors (385186661).

1155559971 is an equidigital number, since it uses as much as digits as its factorization.

1155559971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385186660.

The product of its digits is 354375, while the sum is 48.

The square root of 1155559971 is about 33993.5283693823. The cubic root of 1155559971 is about 1049.3752809921.

The spelling of 1155559971 in words is "one billion, one hundred fifty-five million, five hundred fifty-nine thousand, nine hundred seventy-one".