131775021 has 12 divisors (see below), whose sum is σ = 217533472. Its totient is φ = 75299976.

The previous prime is 131774989. The next prime is 131775023. The reversal of 131775021 is 120577131.

It is a happy number.

It is not a de Polignac number, because 131775021 - 2⁵ = 131774989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131775023) 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 in 11 ways as a sum of consecutive naturals, for example, 1045771 + ... + 1045896.

Almost surely, 2^131775021 is an apocalyptic number.

It is an amenable number.

131775021 is a deficient number, since it is larger than the sum of its proper divisors (85758451).

131775021 is a wasteful number, since it uses less digits than its factorization.

131775021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091680 (or 2091677 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 27.

The square root of 131775021 is about 11479.3301633850. The cubic root of 131775021 is about 508.8749015494.

The spelling of 131775021 in words is "one hundred thirty-one million, seven hundred seventy-five thousand, twenty-one".