542645591 has 4 divisors (see below), whose sum is σ = 542740800. Its totient is φ = 542550384.

The previous prime is 542645581. The next prime is 542645599. The reversal of 542645591 is 195546245.

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 542645591 - 2⁶ = 542645527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542645599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38471 + ... + 50648.

It is an arithmetic number, because the mean of its divisors is an integer number (135685200).

Almost surely, 2^542645591 is an apocalyptic number.

542645591 is a deficient number, since it is larger than the sum of its proper divisors (95209).

542645591 is an equidigital number, since it uses as much as digits as its factorization.

542645591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95208.

The product of its digits is 216000, while the sum is 41.

The square root of 542645591 is about 23294.7545812357. The cubic root of 542645591 is about 815.6529781431.

The spelling of 542645591 in words is "five hundred forty-two million, six hundred forty-five thousand, five hundred ninety-one".