642271087 has 2 divisors, whose sum is σ = 642271088. Its totient is φ = 642271086.

The previous prime is 642271073. The next prime is 642271093. The reversal of 642271087 is 780172246.

642271087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642271087 - 2¹⁵ = 642238319 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642271037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321135543 + 321135544.

It is an arithmetic number, because the mean of its divisors is an integer number (321135544).

Almost surely, 2^642271087 is an apocalyptic number.

642271087 is a deficient number, since it is larger than the sum of its proper divisors (1).

642271087 is an equidigital number, since it uses as much as digits as its factorization.

642271087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 642271087 is about 25343.0678292901. The cubic root of 642271087 is about 862.7920285929.

The spelling of 642271087 in words is "six hundred forty-two million, two hundred seventy-one thousand, eighty-seven".