404802911991 has 16 divisors (see below), whose sum is σ = 556385436000. Its totient is φ = 261598727808.

The previous prime is 404802911963. The next prime is 404802912001. The reversal of 404802911991 is 199119208404.

It is not a de Polignac number, because 404802911991 - 2²¹ = 404800814839 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 404802911991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404802911921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6748716 + ... + 6808433.

It is an arithmetic number, because the mean of its divisors is an integer number (34774089750).

Almost surely, 2^404802911991 is an apocalyptic number.

404802911991 is a deficient number, since it is larger than the sum of its proper divisors (151582524009).

404802911991 is a wasteful number, since it uses less digits than its factorization.

404802911991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13557458.

The product of its (nonzero) digits is 186624, while the sum is 48.

The spelling of 404802911991 in words is "four hundred four billion, eight hundred two million, nine hundred eleven thousand, nine hundred ninety-one".