231081027115261 has 2 divisors, whose sum is σ = 231081027115262. Its totient is φ = 231081027115260.

The previous prime is 231081027115199. The next prime is 231081027115291. The reversal of 231081027115261 is 162511720180132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123134953231161 + 107946073884100 = 11096619^2 + 10389710^2 .

It is a cyclic number.

It is not a de Polignac number, because 231081027115261 - 2¹⁷ = 231081026984189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231081027115291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115540513557630 + 115540513557631.

It is an arithmetic number, because the mean of its divisors is an integer number (115540513557631).

Almost surely, 2^{231081027115261} is an apocalyptic number.

It is an amenable number.

231081027115261 is a deficient number, since it is larger than the sum of its proper divisors (1).

231081027115261 is an equidigital number, since it uses as much as digits as its factorization.

231081027115261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

Adding to 231081027115261 its reverse (162511720180132), we get a palindrome (393592747295393).

The spelling of 231081027115261 in words is "two hundred thirty-one trillion, eighty-one billion, twenty-seven million, one hundred fifteen thousand, two hundred sixty-one".