39491542643 has 4 divisors (see below), whose sum is σ = 45133191600. Its totient is φ = 33849893688.

The previous prime is 39491542631. The next prime is 39491542663. The reversal of 39491542643 is 34624519493.

39491542643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34624519493 = 23 ⋅1505413891.

It is a cyclic number.

It is not a de Polignac number, because 39491542643 - 2⁴ = 39491542627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39491542591 and 39491542600.

It is not an unprimeable number, because it can be changed into a prime (39491542663) 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, 2820824468 + ... + 2820824481.

It is an arithmetic number, because the mean of its divisors is an integer number (11283297900).

Almost surely, 2^39491542643 is an apocalyptic number.

39491542643 is a deficient number, since it is larger than the sum of its proper divisors (5641648957).

39491542643 is an equidigital number, since it uses as much as digits as its factorization.

39491542643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5641648956.

The product of its digits is 2799360, while the sum is 50.

The spelling of 39491542643 in words is "thirty-nine billion, four hundred ninety-one million, five hundred forty-two thousand, six hundred forty-three".