991701120271 has 4 divisors (see below), whose sum is σ = 991755032544. Its totient is φ = 991647208000.

The previous prime is 991701120247. The next prime is 991701120301. The reversal of 991701120271 is 172021107199.

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

It is a cyclic number.

It is not a de Polignac number, because 991701120271 - 2¹¹ = 991701118223 is a prime.

It is a super-2 number, since 2×991701120271² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991701120211) 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, 26928535 + ... + 26965336.

It is an arithmetic number, because the mean of its divisors is an integer number (247938758136).

Almost surely, 2^991701120271 is an apocalyptic number.

991701120271 is a deficient number, since it is larger than the sum of its proper divisors (53912273).

991701120271 is a wasteful number, since it uses less digits than its factorization.

991701120271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53912272.

The product of its (nonzero) digits is 15876, while the sum is 40.

The spelling of 991701120271 in words is "nine hundred ninety-one billion, seven hundred one million, one hundred twenty thousand, two hundred seventy-one".