231564040404161 has 2 divisors, whose sum is σ = 231564040404162. Its totient is φ = 231564040404160.

The previous prime is 231564040404113. The next prime is 231564040404197. The reversal of 231564040404161 is 161404040465132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166497731560000 + 65066308844161 = 12903400^2 + 8066369^2 .

It is a cyclic number.

It is not a de Polignac number, because 231564040404161 - 2⁶ = 231564040404097 is a prime.

It is a super-2 number, since 2×231564040404161² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231564040404661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115782020202080 + 115782020202081.

It is an arithmetic number, because the mean of its divisors is an integer number (115782020202081).

Almost surely, 2^{231564040404161} is an apocalyptic number.

It is an amenable number.

231564040404161 is a deficient number, since it is larger than the sum of its proper divisors (1).

231564040404161 is an equidigital number, since it uses as much as digits as its factorization.

231564040404161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 41.

Adding to 231564040404161 its reverse (161404040465132), we get a palindrome (392968080869293).

The spelling of 231564040404161 in words is "two hundred thirty-one trillion, five hundred sixty-four billion, forty million, four hundred four thousand, one hundred sixty-one".