131121197 has 4 divisors (see below), whose sum is σ = 131146620. Its totient is φ = 131095776.

The previous prime is 131121181. The next prime is 131121241. The reversal of 131121197 is 791121131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79941481 + 51179716 = 8941^2 + 7154^2 .

It is a cyclic number.

It is not a de Polignac number, because 131121197 - 2⁴ = 131121181 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 (131121127) 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, 1922 + ... + 16307.

It is an arithmetic number, because the mean of its divisors is an integer number (32786655).

Almost surely, 2^131121197 is an apocalyptic number.

It is an amenable number.

131121197 is a deficient number, since it is larger than the sum of its proper divisors (25423).

131121197 is an equidigital number, since it uses as much as digits as its factorization.

131121197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25422.

The product of its digits is 378, while the sum is 26.

The square root of 131121197 is about 11450.8164337745. The cubic root of 131121197 is about 508.0318828544.

The spelling of 131121197 in words is "one hundred thirty-one million, one hundred twenty-one thousand, one hundred ninety-seven".