409642241081 has 2 divisors, whose sum is σ = 409642241082. Its totient is φ = 409642241080.

The previous prime is 409642241023. The next prime is 409642241101. The reversal of 409642241081 is 180142246904.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399923436025 + 9718805056 = 632395^2 + 98584^2 .

It is a cyclic number.

It is not a de Polignac number, because 409642241081 - 2²⁶ = 409575132217 is a prime.

It is a super-2 number, since 2×409642241081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (409642247081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204821120540 + 204821120541.

It is an arithmetic number, because the mean of its divisors is an integer number (204821120541).

Almost surely, 2^409642241081 is an apocalyptic number.

It is an amenable number.

409642241081 is a deficient number, since it is larger than the sum of its proper divisors (1).

409642241081 is an equidigital number, since it uses as much as digits as its factorization.

409642241081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 41.

Adding to 409642241081 its reverse (180142246904), we get a palindrome (589784487985).

The spelling of 409642241081 in words is "four hundred nine billion, six hundred forty-two million, two hundred forty-one thousand, eighty-one".