3936729375491 has 4 divisors (see below), whose sum is σ = 4294613864184. Its totient is φ = 3578844886800.

The previous prime is 3936729375433. The next prime is 3936729375563. The reversal of 3936729375491 is 1945739276393.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3936729375491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3936729375401) 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, 178942244330 + ... + 178942244351.

It is an arithmetic number, because the mean of its divisors is an integer number (1073653466046).

Almost surely, 2^{3936729375491} is an apocalyptic number.

3936729375491 is a deficient number, since it is larger than the sum of its proper divisors (357884488693).

3936729375491 is a wasteful number, since it uses less digits than its factorization.

3936729375491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357884488692.

The product of its digits is 231472080, while the sum is 68.

The spelling of 3936729375491 in words is "three trillion, nine hundred thirty-six billion, seven hundred twenty-nine million, three hundred seventy-five thousand, four hundred ninety-one".