131027821 has 4 divisors (see below), whose sum is σ = 131760000. Its totient is φ = 130295644.

The previous prime is 131027807. The next prime is 131027851. The reversal of 131027821 is 128720131.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-131027821 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 (131027851) 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, 365821 + ... + 366178.

It is an arithmetic number, because the mean of its divisors is an integer number (32940000).

Almost surely, 2^131027821 is an apocalyptic number.

It is an amenable number.

131027821 is a deficient number, since it is larger than the sum of its proper divisors (732179).

131027821 is an equidigital number, since it uses as much as digits as its factorization.

131027821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732178.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 131027821 is about 11446.7384437664. The cubic root of 131027821 is about 507.9112584464.

Adding to 131027821 its reverse (128720131), we get a palindrome (259747952).

The spelling of 131027821 in words is "one hundred thirty-one million, twenty-seven thousand, eight hundred twenty-one".