131541778 has 4 divisors (see below), whose sum is σ = 197312670. Its totient is φ = 65770888.

The previous prime is 131541757. The next prime is 131541779. The reversal of 131541778 is 877145131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877145131 = 11243 ⋅78017.

It can be written as a sum of positive squares in only one way, i.e., 121154049 + 10387729 = 11007^2 + 3223^2 .

It is not an unprimeable number, because it can be changed into a prime (131541779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32885443 + ... + 32885446.

Almost surely, 2^131541778 is an apocalyptic number.

131541778 is a deficient number, since it is larger than the sum of its proper divisors (65770892).

131541778 is an equidigital number, since it uses as much as digits as its factorization.

131541778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65770891.

The product of its digits is 23520, while the sum is 37.

The square root of 131541778 is about 11469.1664038848. The cubic root of 131541778 is about 508.5744864807.

The spelling of 131541778 in words is "one hundred thirty-one million, five hundred forty-one thousand, seven hundred seventy-eight".