131541821 has 4 divisors (see below), whose sum is σ = 132066144. Its totient is φ = 131017500.

The previous prime is 131541811. The next prime is 131541827. The reversal of 131541821 is 128145131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131541821 - 2⁶ = 131541757 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 (131541827) 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, 261785 + ... + 262286.

It is an arithmetic number, because the mean of its divisors is an integer number (33016536).

Almost surely, 2^131541821 is an apocalyptic number.

It is an amenable number.

131541821 is a deficient number, since it is larger than the sum of its proper divisors (524323).

131541821 is an equidigital number, since it uses as much as digits as its factorization.

131541821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524322.

The product of its digits is 960, while the sum is 26.

The square root of 131541821 is about 11469.1682784760. The cubic root of 131541821 is about 508.5745418971.

Adding to 131541821 its reverse (128145131), we get a palindrome (259686952).

The spelling of 131541821 in words is "one hundred thirty-one million, five hundred forty-one thousand, eight hundred twenty-one".