1156999443 has 12 divisors (see below), whose sum is σ = 1553921928. Its totient is φ = 765745440.

The previous prime is 1156999439. The next prime is 1156999469. The reversal of 1156999443 is 3449996511.

It is not a de Polignac number, because 1156999443 - 2² = 1156999439 is a prime.

It is a super-2 number, since 2×1156999443² = 2677295422204620498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1156929443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47983 + ... + 67943.

It is an arithmetic number, because the mean of its divisors is an integer number (129493494).

Almost surely, 2^1156999443 is an apocalyptic number.

1156999443 is a deficient number, since it is larger than the sum of its proper divisors (396922485).

1156999443 is an equidigital number, since it uses as much as digits as its factorization.

1156999443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20242 (or 20103 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 51.

The square root of 1156999443 is about 34014.6945157530. The cubic root of 1156999443 is about 1049.8108330421.

The spelling of 1156999443 in words is "one billion, one hundred fifty-six million, nine hundred ninety-nine thousand, four hundred forty-three".