991701813701 has 4 divisors (see below), whose sum is σ = 991705421952. Its totient is φ = 991698205452.

The previous prime is 991701813673. The next prime is 991701813761. The reversal of 991701813701 is 107318107199.

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 not a de Polignac number, because 991701813701 - 2⁶ = 991701813637 is a prime.

It is a super-3 number, since 3×991701813701³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991701813761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1354511 + ... + 1953996.

It is an arithmetic number, because the mean of its divisors is an integer number (247926355488).

Almost surely, 2^991701813701 is an apocalyptic number.

It is an amenable number.

991701813701 is a deficient number, since it is larger than the sum of its proper divisors (3608251).

991701813701 is a wasteful number, since it uses less digits than its factorization.

991701813701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3608250.

The product of its (nonzero) digits is 95256, while the sum is 47.

The spelling of 991701813701 in words is "nine hundred ninety-one billion, seven hundred one million, eight hundred thirteen thousand, seven hundred one".