1197161087 has 4 divisors (see below), whose sum is σ = 1197232800. Its totient is φ = 1197089376.

The previous prime is 1197161059. The next prime is 1197161113. The reversal of 1197161087 is 7801617911.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1197161087 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 (1197161057) 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, 3818 + ... + 49080.

It is an arithmetic number, because the mean of its divisors is an integer number (299308200).

Almost surely, 2^1197161087 is an apocalyptic number.

1197161087 is a deficient number, since it is larger than the sum of its proper divisors (71713).

1197161087 is an equidigital number, since it uses as much as digits as its factorization.

1197161087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71712.

The product of its (nonzero) digits is 21168, while the sum is 41.

The square root of 1197161087 is about 34600.0157080889. The cubic root of 1197161087 is about 1061.8199088038.

Adding to 1197161087 its reverse (7801617911), we get a palindrome (8998778998).

The spelling of 1197161087 in words is "one billion, one hundred ninety-seven million, one hundred sixty-one thousand, eighty-seven".