642573047 has 2 divisors, whose sum is σ = 642573048. Its totient is φ = 642573046.

The previous prime is 642572999. The next prime is 642573059. The reversal of 642573047 is 740375246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642573047 - 2¹⁰ = 642572023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642573047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642573647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321286523 + 321286524.

It is an arithmetic number, because the mean of its divisors is an integer number (321286524).

Almost surely, 2^642573047 is an apocalyptic number.

642573047 is a deficient number, since it is larger than the sum of its proper divisors (1).

642573047 is an equidigital number, since it uses as much as digits as its factorization.

642573047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 38.

The square root of 642573047 is about 25349.0245768945. The cubic root of 642573047 is about 862.9272196195.

The spelling of 642573047 in words is "six hundred forty-two million, five hundred seventy-three thousand, forty-seven".