131391146 has 4 divisors (see below), whose sum is σ = 197086722. Its totient is φ = 65695572.

The previous prime is 131391049. The next prime is 131391149. The reversal of 131391146 is 641193131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 641193131 = 17 ⋅37717243.

It can be written as a sum of positive squares in only one way, i.e., 104755225 + 26635921 = 10235^2 + 5161^2 .

It is not an unprimeable number, because it can be changed into a prime (131391149) 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, 32847785 + ... + 32847788.

Almost surely, 2^131391146 is an apocalyptic number.

131391146 is a deficient number, since it is larger than the sum of its proper divisors (65695576).

131391146 is an equidigital number, since it uses as much as digits as its factorization.

131391146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65695575.

The product of its digits is 1944, while the sum is 29.

The square root of 131391146 is about 11462.5976986022. The cubic root of 131391146 is about 508.3802849284.

The spelling of 131391146 in words is "one hundred thirty-one million, three hundred ninety-one thousand, one hundred forty-six".