3949197500691 has 12 divisors (see below), whose sum is σ = 5704760696232. Its totient is φ = 2632630192416.

The previous prime is 3949197500687. The next prime is 3949197500711. The reversal of 3949197500691 is 1960057919493.

3949197500691 is a `hidden beast` number, since 3 + 9 + 491 + 9 + 7 + 50 + 0 + 6 + 91 = 666.

It is not a de Polignac number, because 3949197500691 - 2² = 3949197500687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3949197500791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13862946 + ... + 14144951.

It is an arithmetic number, because the mean of its divisors is an integer number (475396724686).

Almost surely, 2^{3949197500691} is an apocalyptic number.

3949197500691 is a deficient number, since it is larger than the sum of its proper divisors (1755563195541).

3949197500691 is a wasteful number, since it uses less digits than its factorization.

3949197500691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28023570 (or 28023567 counting only the distinct ones).

The product of its (nonzero) digits is 16533720, while the sum is 63.

The spelling of 3949197500691 in words is "three trillion, nine hundred forty-nine billion, one hundred ninety-seven million, five hundred thousand, six hundred ninety-one".