3935249142691 has 4 divisors (see below), whose sum is σ = 3935253774384. Its totient is φ = 3935244511000.

The previous prime is 3935249142593. The next prime is 3935249142701. The reversal of 3935249142691 is 1962419425393.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3935249142691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3935249542691) 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, 634495 + ... + 2876296.

It is an arithmetic number, because the mean of its divisors is an integer number (983813443596).

Almost surely, 2^{3935249142691} is an apocalyptic number.

3935249142691 is a deficient number, since it is larger than the sum of its proper divisors (4631693).

3935249142691 is a wasteful number, since it uses less digits than its factorization.

3935249142691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4631692.

The product of its digits is 12597120, while the sum is 58.

The spelling of 3935249142691 in words is "three trillion, nine hundred thirty-five billion, two hundred forty-nine million, one hundred forty-two thousand, six hundred ninety-one".