842233991 has 4 divisors (see below), whose sum is σ = 861820872. Its totient is φ = 822647112.

The previous prime is 842233969. The next prime is 842233993. The reversal of 842233991 is 199332248.

842233991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842233991 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 (842233993) 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, 9793376 + ... + 9793461.

It is an arithmetic number, because the mean of its divisors is an integer number (215455218).

Almost surely, 2^842233991 is an apocalyptic number.

842233991 is a deficient number, since it is larger than the sum of its proper divisors (19586881).

842233991 is a wasteful number, since it uses less digits than its factorization.

842233991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19586880.

The product of its digits is 93312, while the sum is 41.

The square root of 842233991 is about 29021.2679082083. The cubic root of 842233991 is about 944.3745069006.

The spelling of 842233991 in words is "eight hundred forty-two million, two hundred thirty-three thousand, nine hundred ninety-one".