131800001321 has 2 divisors, whose sum is σ = 131800001322. Its totient is φ = 131800001320.

The previous prime is 131800001317. The next prime is 131800001329. The reversal of 131800001321 is 123100008131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111045565225 + 20754436096 = 333235^2 + 144064^2 .

It is an emirp because it is prime and its reverse (123100008131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131800001321 - 2² = 131800001317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131800001293 and 131800001302.

It is not a weakly prime, because it can be changed into another prime (131800001329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65900000660 + 65900000661.

It is an arithmetic number, because the mean of its divisors is an integer number (65900000661).

Almost surely, 2^131800001321 is an apocalyptic number.

It is an amenable number.

131800001321 is a deficient number, since it is larger than the sum of its proper divisors (1).

131800001321 is an equidigital number, since it uses as much as digits as its factorization.

131800001321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 131800001321 its reverse (123100008131), we get a palindrome (254900009452).

The spelling of 131800001321 in words is "one hundred thirty-one billion, eight hundred million, one thousand, three hundred twenty-one".