1163541491 has 4 divisors (see below), whose sum is σ = 1329761712. Its totient is φ = 997321272.

The previous prime is 1163541487. The next prime is 1163541521. The reversal of 1163541491 is 1941453611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1941453611 = 19 ⋅102181769.

It is a cyclic number.

It is not a de Polignac number, because 1163541491 - 2² = 1163541487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1163541191) 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, 83110100 + ... + 83110113.

It is an arithmetic number, because the mean of its divisors is an integer number (332440428).

Almost surely, 2^1163541491 is an apocalyptic number.

1163541491 is a deficient number, since it is larger than the sum of its proper divisors (166220221).

1163541491 is an equidigital number, since it uses as much as digits as its factorization.

1163541491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166220220.

The product of its digits is 12960, while the sum is 35.

The square root of 1163541491 is about 34110.7239882123. The cubic root of 1163541491 is about 1051.7857717358.

The spelling of 1163541491 in words is "one billion, one hundred sixty-three million, five hundred forty-one thousand, four hundred ninety-one".