131557947193 has 4 divisors (see below), whose sum is σ = 131896142820. Its totient is φ = 131219751568.

The previous prime is 131557947187. The next prime is 131557947203. The reversal of 131557947193 is 391749755131.

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 92822590224 + 38735356969 = 304668^2 + 196813^2 .

It is a cyclic number.

It is not a de Polignac number, because 131557947193 - 2¹⁷ = 131557816121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131557947163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169097230 + ... + 169098007.

It is an arithmetic number, because the mean of its divisors is an integer number (32974035705).

Almost surely, 2^131557947193 is an apocalyptic number.

It is an amenable number.

131557947193 is a deficient number, since it is larger than the sum of its proper divisors (338195627).

131557947193 is an equidigital number, since it uses as much as digits as its factorization.

131557947193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338195626.

The product of its digits is 3572100, while the sum is 55.

The spelling of 131557947193 in words is "one hundred thirty-one billion, five hundred fifty-seven million, nine hundred forty-seven thousand, one hundred ninety-three".