131224001 has 4 divisors (see below), whose sum is σ = 131320404. Its totient is φ = 131127600.

The previous prime is 131223991. The next prime is 131224007. The reversal of 131224001 is 100422131.

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 63984001 + 67240000 = 7999^2 + 8200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131224001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131224007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46130 + ... + 48891.

It is an arithmetic number, because the mean of its divisors is an integer number (32830101).

Almost surely, 2^131224001 is an apocalyptic number.

It is an amenable number.

131224001 is a deficient number, since it is larger than the sum of its proper divisors (96403).

131224001 is an equidigital number, since it uses as much as digits as its factorization.

131224001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96402.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 131224001 is about 11455.3044918064. The cubic root of 131224001 is about 508.1646202691.

Adding to 131224001 its reverse (100422131), we get a palindrome (231646132).

The spelling of 131224001 in words is "one hundred thirty-one million, two hundred twenty-four thousand, one".