642945587 has 2 divisors, whose sum is σ = 642945588. Its totient is φ = 642945586.

The previous prime is 642945581. The next prime is 642945607. The reversal of 642945587 is 785549246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642945587 - 2¹² = 642941491 is a prime.

It is not a weakly prime, because it can be changed into another prime (642945581) 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 as a sum of consecutive naturals, namely, 321472793 + 321472794.

It is an arithmetic number, because the mean of its divisors is an integer number (321472794).

Almost surely, 2^642945587 is an apocalyptic number.

642945587 is a deficient number, since it is larger than the sum of its proper divisors (1).

642945587 is an equidigital number, since it uses as much as digits as its factorization.

642945587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2419200, while the sum is 50.

The square root of 642945587 is about 25356.3717238883. The cubic root of 642945587 is about 863.0939517919.

The spelling of 642945587 in words is "six hundred forty-two million, nine hundred forty-five thousand, five hundred eighty-seven".