991837041 has 8 divisors (see below), whose sum is σ = 1424176320. Its totient is φ = 610361232.

The previous prime is 991836991. The next prime is 991837043. The reversal of 991837041 is 140738199.

It is a happy number.

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

It is not a de Polignac number, because 991837041 - 2⁶ = 991836977 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 991836984 and 991837002.

It is not an unprimeable number, because it can be changed into a prime (991837043) 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, 12715821 + ... + 12715898.

It is an arithmetic number, because the mean of its divisors is an integer number (178022040).

Almost surely, 2^991837041 is an apocalyptic number.

It is an amenable number.

991837041 is a deficient number, since it is larger than the sum of its proper divisors (432339279).

991837041 is a wasteful number, since it uses less digits than its factorization.

991837041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25431735.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 991837041 is about 31493.4444130838. Note that the first 4 decimals coincide. The cubic root of 991837041 is about 997.2715761403.

The spelling of 991837041 in words is "nine hundred ninety-one million, eight hundred thirty-seven thousand, forty-one".