991445535241 has 8 divisors (see below), whose sum is σ = 1138832291520. Its totient is φ = 845496698928.

The previous prime is 991445535203. The next prime is 991445535257. The reversal of 991445535241 is 142535544199.

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

It is a de Polignac number, because none of the positive numbers 2^k-991445535241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (991445530241) 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, 359478511 + ... + 359481268.

It is an arithmetic number, because the mean of its divisors is an integer number (142354036440).

Almost surely, 2^991445535241 is an apocalyptic number.

It is an amenable number.

991445535241 is a deficient number, since it is larger than the sum of its proper divisors (147386756279).

991445535241 is a wasteful number, since it uses less digits than its factorization.

991445535241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718959983.

The product of its digits is 3888000, while the sum is 52.

The spelling of 991445535241 in words is "nine hundred ninety-one billion, four hundred forty-five million, five hundred thirty-five thousand, two hundred forty-one".