1161328197 has 4 divisors (see below), whose sum is σ = 1548437600. Its totient is φ = 774218796.

The previous prime is 1161328177. The next prime is 1161328237. The reversal of 1161328197 is 7918231611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1161328197 - 2²⁶ = 1094219333 is a prime.

It is a super-2 number, since 2×1161328197² = 2697366362294541618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161328117) 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, 193554697 + ... + 193554702.

It is an arithmetic number, because the mean of its divisors is an integer number (387109400).

Almost surely, 2^1161328197 is an apocalyptic number.

It is an amenable number.

1161328197 is a deficient number, since it is larger than the sum of its proper divisors (387109403).

1161328197 is an equidigital number, since it uses as much as digits as its factorization.

1161328197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387109402.

The product of its digits is 18144, while the sum is 39.

The square root of 1161328197 is about 34078.2657569308. The cubic root of 1161328197 is about 1051.1184445076.

The spelling of 1161328197 in words is "one billion, one hundred sixty-one million, three hundred twenty-eight thousand, one hundred ninety-seven".