131778019 has 2 divisors, whose sum is σ = 131778020. Its totient is φ = 131778018.

The previous prime is 131778013. The next prime is 131778047. The reversal of 131778019 is 910877131.

It is a weak prime.

It is an emirp because it is prime and its reverse (910877131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131778019 - 2¹⁷ = 131646947 is a prime.

It is a super-2 number, since 2×131778019² = 34730892583128722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131778013) 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, 65889009 + 65889010.

It is an arithmetic number, because the mean of its divisors is an integer number (65889010).

Almost surely, 2^131778019 is an apocalyptic number.

131778019 is a deficient number, since it is larger than the sum of its proper divisors (1).

131778019 is an equidigital number, since it uses as much as digits as its factorization.

131778019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 37.

The square root of 131778019 is about 11479.4607451744. The cubic root of 131778019 is about 508.8787606404.

The spelling of 131778019 in words is "one hundred thirty-one million, seven hundred seventy-eight thousand, nineteen".