991045402411 has 4 divisors (see below), whose sum is σ = 994547329912. Its totient is φ = 987543474912.

The previous prime is 991045402297. The next prime is 991045402469. The reversal of 991045402411 is 114204540199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 114204540199 = 397 ⋅287668867.

It is a cyclic number.

It is not a de Polignac number, because 991045402411 - 2¹¹ = 991045400363 is a prime.

It is a super-2 number, since 2×991045402411² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991040402411) 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, 1750963326 + ... + 1750963891.

It is an arithmetic number, because the mean of its divisors is an integer number (248636832478).

Almost surely, 2^991045402411 is an apocalyptic number.

991045402411 is a deficient number, since it is larger than the sum of its proper divisors (3501927501).

991045402411 is a wasteful number, since it uses less digits than its factorization.

991045402411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501927500.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 991045402411 in words is "nine hundred ninety-one billion, forty-five million, four hundred two thousand, four hundred eleven".