642860093 has 2 divisors, whose sum is σ = 642860094. Its totient is φ = 642860092.

The previous prime is 642860027. The next prime is 642860111. The reversal of 642860093 is 390068246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 482153764 + 160706329 = 21958^2 + 12677^2 .

It is a cyclic number.

It is not a de Polignac number, because 642860093 - 2¹⁰ = 642859069 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 (642860293) 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, 321430046 + 321430047.

It is an arithmetic number, because the mean of its divisors is an integer number (321430047).

Almost surely, 2^642860093 is an apocalyptic number.

It is an amenable number.

642860093 is a deficient number, since it is larger than the sum of its proper divisors (1).

642860093 is an equidigital number, since it uses as much as digits as its factorization.

642860093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 642860093 is about 25354.6858193905. The cubic root of 642860093 is about 863.0556942126.

The spelling of 642860093 in words is "six hundred forty-two million, eight hundred sixty thousand, ninety-three".