9991402043 has 8 divisors (see below), whose sum is σ = 11419481088. Its totient is φ = 8563506984.

The previous prime is 9991402019. The next prime is 9991402067. The reversal of 9991402043 is 3402041999.

It is an interprime number because it is at equal distance from previous prime (9991402019) and next prime (9991402067).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9991402043 - 2²² = 9987207739 is a prime.

It is a super-2 number, since 2×9991402043² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9991402013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102230 + ... + 174452.

It is an arithmetic number, because the mean of its divisors is an integer number (1427435136).

Almost surely, 2^9991402043 is an apocalyptic number.

9991402043 is a deficient number, since it is larger than the sum of its proper divisors (1428079045).

9991402043 is a wasteful number, since it uses less digits than its factorization.

9991402043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91993.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 9991402043 is about 99957.0009704173. Note that the first 3 decimals coincide. The cubic root of 9991402043 is about 2153.8170550906.

The spelling of 9991402043 in words is "nine billion, nine hundred ninety-one million, four hundred two thousand, forty-three".