1161422287 has 4 divisors (see below), whose sum is σ = 1178757016. Its totient is φ = 1144087560.

The previous prime is 1161422263. The next prime is 1161422323. The reversal of 1161422287 is 7822241611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7822241611 = 661 ⋅11833951.

It is a cyclic number.

It is not a de Polignac number, because 1161422287 - 2¹⁵ = 1161389519 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 (1161422887) 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, 8667264 + ... + 8667397.

It is an arithmetic number, because the mean of its divisors is an integer number (294689254).

Almost surely, 2^1161422287 is an apocalyptic number.

1161422287 is a deficient number, since it is larger than the sum of its proper divisors (17334729).

1161422287 is an equidigital number, since it uses as much as digits as its factorization.

1161422287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17334728.

The product of its digits is 10752, while the sum is 34.

The square root of 1161422287 is about 34079.6462276239. The cubic root of 1161422287 is about 1051.1468307019.

Adding to 1161422287 its reverse (7822241611), we get a palindrome (8983663898).

The spelling of 1161422287 in words is "one billion, one hundred sixty-one million, four hundred twenty-two thousand, two hundred eighty-seven".