131194157 has 2 divisors, whose sum is σ = 131194158. Its totient is φ = 131194156.

The previous prime is 131194153. The next prime is 131194159. The reversal of 131194157 is 751491131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95922436 + 35271721 = 9794^2 + 5939^2 .

It is a cyclic number.

It is not a de Polignac number, because 131194157 - 2² = 131194153 is a prime.

Together with 131194159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131194153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65597078 + 65597079.

It is an arithmetic number, because the mean of its divisors is an integer number (65597079).

Almost surely, 2^131194157 is an apocalyptic number.

It is an amenable number.

131194157 is a deficient number, since it is larger than the sum of its proper divisors (1).

131194157 is an equidigital number, since it uses as much as digits as its factorization.

131194157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 32.

The square root of 131194157 is about 11454.0017897676. The cubic root of 131194157 is about 508.1260937428.

The spelling of 131194157 in words is "one hundred thirty-one million, one hundred ninety-four thousand, one hundred fifty-seven".