6542404091 has 2 divisors, whose sum is σ = 6542404092. Its totient is φ = 6542404090.

The previous prime is 6542404087. The next prime is 6542404093. The reversal of 6542404091 is 1904042456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6542404091 - 2² = 6542404087 is a prime.

Together with 6542404093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6542404093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3271202045 + 3271202046.

It is an arithmetic number, because the mean of its divisors is an integer number (3271202046).

Almost surely, 2^6542404091 is an apocalyptic number.

6542404091 is a deficient number, since it is larger than the sum of its proper divisors (1).

6542404091 is an equidigital number, since it uses as much as digits as its factorization.

6542404091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 6542404091 is about 80885.1289854940. The cubic root of 6542404091 is about 1870.3050862961.

The spelling of 6542404091 in words is "six billion, five hundred forty-two million, four hundred four thousand, ninety-one".