231302101981 has 2 divisors, whose sum is σ = 231302101982. Its totient is φ = 231302101980.

The previous prime is 231302101951. The next prime is 231302102071. The reversal of 231302101981 is 189101203132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210918829081 + 20383272900 = 459259^2 + 142770^2 .

It is a cyclic number.

It is not a de Polignac number, because 231302101981 - 2¹¹ = 231302099933 is a prime.

It is a super-2 number, since 2×231302101981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231302101951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115651050990 + 115651050991.

It is an arithmetic number, because the mean of its divisors is an integer number (115651050991).

Almost surely, 2^231302101981 is an apocalyptic number.

It is an amenable number.

231302101981 is a deficient number, since it is larger than the sum of its proper divisors (1).

231302101981 is an equidigital number, since it uses as much as digits as its factorization.

231302101981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 231302101981 in words is "two hundred thirty-one billion, three hundred two million, one hundred one thousand, nine hundred eighty-one".