131778043 has 4 divisors (see below), whose sum is σ = 132343848. Its totient is φ = 131212240.

The previous prime is 131778019. The next prime is 131778047. The reversal of 131778043 is 340877131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131778043 - 2⁹ = 131777531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131778047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282553 + ... + 283018.

It is an arithmetic number, because the mean of its divisors is an integer number (33085962).

Almost surely, 2^131778043 is an apocalyptic number.

131778043 is a deficient number, since it is larger than the sum of its proper divisors (565805).

131778043 is an equidigital number, since it uses as much as digits as its factorization.

131778043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565804.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 131778043 is about 11479.4617905196. The cubic root of 131778043 is about 508.8787915335.

The spelling of 131778043 in words is "one hundred thirty-one million, seven hundred seventy-eight thousand, forty-three".