39705139091 has 4 divisors (see below), whose sum is σ = 39968087184. Its totient is φ = 39442191000.

The previous prime is 39705139087. The next prime is 39705139099. The reversal of 39705139091 is 19093150793.

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

It is a cyclic number.

It is not a de Polignac number, because 39705139091 - 2² = 39705139087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39705139099) 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, 131473820 + ... + 131474121.

It is an arithmetic number, because the mean of its divisors is an integer number (9992021796).

Almost surely, 2^39705139091 is an apocalyptic number.

39705139091 is a deficient number, since it is larger than the sum of its proper divisors (262948093).

39705139091 is a wasteful number, since it uses less digits than its factorization.

39705139091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262948092.

The product of its (nonzero) digits is 229635, while the sum is 47.

The spelling of 39705139091 in words is "thirty-nine billion, seven hundred five million, one hundred thirty-nine thousand, ninety-one".