231311133281 has 2 divisors, whose sum is σ = 231311133282. Its totient is φ = 231311133280.

The previous prime is 231311133269. The next prime is 231311133329. The reversal of 231311133281 is 182331113132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133038915025 + 98272218256 = 364745^2 + 313484^2 .

It is a cyclic number.

It is not a de Polignac number, because 231311133281 - 2¹⁰ = 231311132257 is a prime.

It is a super-2 number, since 2×231311133281² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231311133181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115655566640 + 115655566641.

It is an arithmetic number, because the mean of its divisors is an integer number (115655566641).

Almost surely, 2^231311133281 is an apocalyptic number.

It is an amenable number.

231311133281 is a deficient number, since it is larger than the sum of its proper divisors (1).

231311133281 is an equidigital number, since it uses as much as digits as its factorization.

231311133281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The spelling of 231311133281 in words is "two hundred thirty-one billion, three hundred eleven million, one hundred thirty-three thousand, two hundred eighty-one".