131920786 has 4 divisors (see below), whose sum is σ = 197881182. Its totient is φ = 65960392.

The previous prime is 131920777. The next prime is 131920807. The reversal of 131920786 is 687029131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 687029131 = 107 ⋅6420833.

It can be written as a sum of positive squares in only one way, i.e., 120231225 + 11689561 = 10965^2 + 3419^2 .

It is an unprimeable number.

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, 32980195 + ... + 32980198.

Almost surely, 2^131920786 is an apocalyptic number.

131920786 is a deficient number, since it is larger than the sum of its proper divisors (65960396).

131920786 is an equidigital number, since it uses as much as digits as its factorization.

131920786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65960395.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 131920786 is about 11485.6774288677. The cubic root of 131920786 is about 509.0624657172.

The spelling of 131920786 in words is "one hundred thirty-one million, nine hundred twenty thousand, seven hundred eighty-six".