991204241 has 4 divisors (see below), whose sum is σ = 996393984. Its totient is φ = 986014500.

The previous prime is 991204229. The next prime is 991204273. The reversal of 991204241 is 142402199.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991204241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 991204198 and 991204207.

It is not an unprimeable number, because it can be changed into a prime (991204441) 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, 2594585 + ... + 2594966.

It is an arithmetic number, because the mean of its divisors is an integer number (249098496).

Almost surely, 2^991204241 is an apocalyptic number.

It is an amenable number.

991204241 is a deficient number, since it is larger than the sum of its proper divisors (5189743).

991204241 is a wasteful number, since it uses less digits than its factorization.

991204241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5189742.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 991204241 is about 31483.3962748621. The cubic root of 991204241 is about 997.0594419271.

The spelling of 991204241 in words is "nine hundred ninety-one million, two hundred four thousand, two hundred forty-one".