6541491047 has 16 divisors (see below), whose sum is σ = 8524660032. Its totient is φ = 4871232000.

The previous prime is 6541491041. The next prime is 6541491049. The reversal of 6541491047 is 7401941456.

It is a cyclic number.

It is not a de Polignac number, because 6541491047 - 2⁶ = 6541490983 is a prime.

It is a super-2 number, since 2×6541491047² = 85582210235962312418, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 6541490995 and 6541491013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6541491041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2112704 + ... + 2115797.

It is an arithmetic number, because the mean of its divisors is an integer number (532791252).

Almost surely, 2^6541491047 is an apocalyptic number.

6541491047 is a deficient number, since it is larger than the sum of its proper divisors (1983168985).

6541491047 is a wasteful number, since it uses less digits than its factorization.

6541491047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4228538.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 6541491047 is about 80879.4847102774. The cubic root of 6541491047 is about 1870.2180769817.

The spelling of 6541491047 in words is "six billion, five hundred forty-one million, four hundred ninety-one thousand, forty-seven".