130731821 has 8 divisors (see below), whose sum is σ = 146095488. Its totient is φ = 115948000.

The previous prime is 130731817. The next prime is 130731857. The reversal of 130731821 is 128137031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 130731821 - 2² = 130731817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130731871) 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 7 ways as a sum of consecutive naturals, for example, 144485 + ... + 145386.

It is an arithmetic number, because the mean of its divisors is an integer number (18261936).

Almost surely, 2^130731821 is an apocalyptic number.

130731821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

130731821 is a deficient number, since it is larger than the sum of its proper divisors (15363667).

130731821 is a wasteful number, since it uses less digits than its factorization.

130731821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289923.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 130731821 is about 11433.8016862284. The cubic root of 130731821 is about 507.5285023668.

Adding to 130731821 its reverse (128137031), we get a palindrome (258868852).

The spelling of 130731821 in words is "one hundred thirty million, seven hundred thirty-one thousand, eight hundred twenty-one".