131236451197 has 4 divisors (see below), whose sum is σ = 131270515900. Its totient is φ = 131202386496.

The previous prime is 131236451189. The next prime is 131236451219. The reversal of 131236451197 is 791154632131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 791154632131 = 5023 ⋅157506397.

It can be written as a sum of positive squares in 2 ways, for example, as 67594280121 + 63642171076 = 259989^2 + 252274^2 .

It is a cyclic number.

It is not a de Polignac number, because 131236451197 - 2³ = 131236451189 is a prime.

It is a super-2 number, since 2×131236451197² (a number of 23 digits) 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 (131236451147) 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, 17026572 + ... + 17034277.

It is an arithmetic number, because the mean of its divisors is an integer number (32817628975).

Almost surely, 2^131236451197 is an apocalyptic number.

It is an amenable number.

131236451197 is a deficient number, since it is larger than the sum of its proper divisors (34064703).

131236451197 is an equidigital number, since it uses as much as digits as its factorization.

131236451197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34064702.

The product of its digits is 136080, while the sum is 43.

The spelling of 131236451197 in words is "one hundred thirty-one billion, two hundred thirty-six million, four hundred fifty-one thousand, one hundred ninety-seven".