409775921101 has 4 divisors (see below), whose sum is σ = 419770455804. Its totient is φ = 399781386400.

The previous prime is 409775921059. The next prime is 409775921173. The reversal of 409775921101 is 101129577904.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 153511158025 + 256264763076 = 391805^2 + 506226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-409775921101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409775931101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4997267290 + ... + 4997267371.

It is an arithmetic number, because the mean of its divisors is an integer number (104942613951).

Almost surely, 2^409775921101 is an apocalyptic number.

409775921101 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

409775921101 is a deficient number, since it is larger than the sum of its proper divisors (9994534703).

409775921101 is an equidigital number, since it uses as much as digits as its factorization.

409775921101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9994534702.

The product of its (nonzero) digits is 158760, while the sum is 46.

The spelling of 409775921101 in words is "four hundred nine billion, seven hundred seventy-five million, nine hundred twenty-one thousand, one hundred one".