399841541081 has 2 divisors, whose sum is σ = 399841541082. Its totient is φ = 399841541080.

The previous prime is 399841541053. The next prime is 399841541123. The reversal of 399841541081 is 180145148993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206497536400 + 193344004681 = 454420^2 + 439709^2 .

It is an emirp because it is prime and its reverse (180145148993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399841541081 - 2³⁸ = 124963634137 is a prime.

It is a super-2 number, since 2×399841541081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (399841541051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199920770540 + 199920770541.

It is an arithmetic number, because the mean of its divisors is an integer number (199920770541).

Almost surely, 2^399841541081 is an apocalyptic number.

It is an amenable number.

399841541081 is a deficient number, since it is larger than the sum of its proper divisors (1).

399841541081 is an equidigital number, since it uses as much as digits as its factorization.

399841541081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 53.

The spelling of 399841541081 in words is "three hundred ninety-nine billion, eight hundred forty-one million, five hundred forty-one thousand, eighty-one".