131774821 has 2 divisors, whose sum is σ = 131774822. Its totient is φ = 131774820.

The previous prime is 131774813. The next prime is 131774849. The reversal of 131774821 is 128477131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125216100 + 6558721 = 11190^2 + 2561^2 .

It is a cyclic number.

It is not a de Polignac number, because 131774821 - 2³ = 131774813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131772821) 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, 65887410 + 65887411.

It is an arithmetic number, because the mean of its divisors is an integer number (65887411).

Almost surely, 2^131774821 is an apocalyptic number.

It is an amenable number.

131774821 is a deficient number, since it is larger than the sum of its proper divisors (1).

131774821 is an equidigital number, since it uses as much as digits as its factorization.

131774821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 34.

The square root of 131774821 is about 11479.3214520720. The cubic root of 131774821 is about 508.8746441030.

The spelling of 131774821 in words is "one hundred thirty-one million, seven hundred seventy-four thousand, eight hundred twenty-one".