131450021 has 4 divisors (see below), whose sum is σ = 131525772. Its totient is φ = 131374272.

The previous prime is 131450009. The next prime is 131450041. The reversal of 131450021 is 120054131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 81902500 + 49547521 = 9050^2 + 7039^2 .

It is a cyclic number.

It is not a de Polignac number, because 131450021 - 2¹⁰ = 131448997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131450041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35210 + ... + 38763.

It is an arithmetic number, because the mean of its divisors is an integer number (32881443).

Almost surely, 2^131450021 is an apocalyptic number.

It is an amenable number.

131450021 is a deficient number, since it is larger than the sum of its proper divisors (75751).

131450021 is an equidigital number, since it uses as much as digits as its factorization.

131450021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75750.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 131450021 is about 11465.1655461227. The cubic root of 131450021 is about 508.4562068879.

The spelling of 131450021 in words is "one hundred thirty-one million, four hundred fifty thousand, twenty-one".