3991574614121 has 8 divisors (see below), whose sum is σ = 4298006564640. Its totient is φ = 3693101935168.

The previous prime is 3991574614091. The next prime is 3991574614129. The reversal of 3991574614121 is 1214164751993.

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-3991574614121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3991574614129) 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, 1989816851 + ... + 1989818856.

It is an arithmetic number, because the mean of its divisors is an integer number (537250820580).

Almost surely, 2^{3991574614121} is an apocalyptic number.

It is an amenable number.

3991574614121 is a deficient number, since it is larger than the sum of its proper divisors (306431950519).

3991574614121 is a wasteful number, since it uses less digits than its factorization.

3991574614121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3979635783.

The product of its digits is 1632960, while the sum is 53.

The spelling of 3991574614121 in words is "three trillion, nine hundred ninety-one billion, five hundred seventy-four million, six hundred fourteen thousand, one hundred twenty-one".