131201200981 has 2 divisors, whose sum is σ = 131201200982. Its totient is φ = 131201200980.

The previous prime is 131201200979. The next prime is 131201201009. The reversal of 131201200981 is 189002102131.

It is an a-pointer prime, because the next prime (131201201009) can be obtained adding 131201200981 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67306000356 + 63895200625 = 259434^2 + 252775^2 .

It is a cyclic number.

It is not a de Polignac number, because 131201200981 - 2¹ = 131201200979 is a prime.

It is a super-2 number, since 2×131201200981² (a number of 23 digits) contains 22 as substring.

Together with 131201200979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131301200981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65600600490 + 65600600491.

It is an arithmetic number, because the mean of its divisors is an integer number (65600600491).

Almost surely, 2^131201200981 is an apocalyptic number.

It is an amenable number.

131201200981 is a deficient number, since it is larger than the sum of its proper divisors (1).

131201200981 is an equidigital number, since it uses as much as digits as its factorization.

131201200981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 28.

The spelling of 131201200981 in words is "one hundred thirty-one billion, two hundred one million, two hundred thousand, nine hundred eighty-one".