409695027881 has 2 divisors, whose sum is σ = 409695027882. Its totient is φ = 409695027880.

The previous prime is 409695027839. The next prime is 409695027883. The reversal of 409695027881 is 188720596904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385869561856 + 23825466025 = 621184^2 + 154355^2 .

It is a cyclic number.

It is not a de Polignac number, because 409695027881 - 2²⁶ = 409627919017 is a prime.

It is a super-2 number, since 2×409695027881² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 409695027883, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 409695027881.

It is not a weakly prime, because it can be changed into another prime (409695027883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204847513940 + 204847513941.

It is an arithmetic number, because the mean of its divisors is an integer number (204847513941).

Almost surely, 2^409695027881 is an apocalyptic number.

It is an amenable number.

409695027881 is a deficient number, since it is larger than the sum of its proper divisors (1).

409695027881 is an equidigital number, since it uses as much as digits as its factorization.

409695027881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 59.

The spelling of 409695027881 in words is "four hundred nine billion, six hundred ninety-five million, twenty-seven thousand, eight hundred eighty-one".