12720131 has 8 divisors (see below), whose sum is σ = 13782384. Its totient is φ = 11692800.

The previous prime is 12720107. The next prime is 12720133. The reversal of 12720131 is 13102721.

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

It is a cyclic number.

It is not a de Polignac number, because 12720131 - 2¹⁰ = 12719107 is a prime.

It is a super-2 number, since 2×12720131² = 323603465314322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12720133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7970 + ... + 9431.

It is an arithmetic number, because the mean of its divisors is an integer number (1722798).

Almost surely, 2^12720131 is an apocalyptic number.

12720131 is a deficient number, since it is larger than the sum of its proper divisors (1062253).

12720131 is a wasteful number, since it uses less digits than its factorization.

12720131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17461.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 12720131 is about 3566.5292652662. The cubic root of 12720131 is about 233.4338652962.

Adding to 12720131 its reverse (13102721), we get a palindrome (25822852).

The spelling of 12720131 in words is "twelve million, seven hundred twenty thousand, one hundred thirty-one".