642548887 has 2 divisors, whose sum is σ = 642548888. Its totient is φ = 642548886.

The previous prime is 642548869. The next prime is 642548903. The reversal of 642548887 is 788845246.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642548887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642548857) 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, 321274443 + 321274444.

It is an arithmetic number, because the mean of its divisors is an integer number (321274444).

Almost surely, 2^642548887 is an apocalyptic number.

642548887 is a deficient number, since it is larger than the sum of its proper divisors (1).

642548887 is an equidigital number, since it uses as much as digits as its factorization.

642548887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3440640, while the sum is 52.

The square root of 642548887 is about 25348.5480254787. The cubic root of 642548887 is about 862.9164044637.

The spelling of 642548887 in words is "six hundred forty-two million, five hundred forty-eight thousand, eight hundred eighty-seven".