3991574681701 has 4 divisors (see below), whose sum is σ = 3996738427212. Its totient is φ = 3986410936192.

The previous prime is 3991574681621. The next prime is 3991574681723. The reversal of 3991574681701 is 1071864751993.

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

It can be written as a sum of positive squares in 2 ways, for example, as 282464612676 + 3709110069025 = 531474^2 + 1925905^2 .

It is a cyclic number.

It is not a de Polignac number, because 3991574681701 - 2²⁷ = 3991440463973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3991574681701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991574682701) 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, 2581871596 + ... + 2581873141.

It is an arithmetic number, because the mean of its divisors is an integer number (999184606803).

Almost surely, 2^{3991574681701} is an apocalyptic number.

It is an amenable number.

3991574681701 is a deficient number, since it is larger than the sum of its proper divisors (5163745511).

3991574681701 is an equidigital number, since it uses as much as digits as its factorization.

3991574681701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5163745510.

The product of its (nonzero) digits is 11430720, while the sum is 61.

The spelling of 3991574681701 in words is "three trillion, nine hundred ninety-one billion, five hundred seventy-four million, six hundred eighty-one thousand, seven hundred one".