642271093 has 2 divisors, whose sum is σ = 642271094. Its totient is φ = 642271092.

The previous prime is 642271087. The next prime is 642271127. The reversal of 642271093 is 390172246.

It is an a-pointer prime, because the next prime (642271127) can be obtained adding 642271093 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 462121009 + 180150084 = 21497^2 + 13422^2 .

It is a cyclic number.

It is not a de Polignac number, because 642271093 - 2⁹ = 642270581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642271073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321135546 + 321135547.

It is an arithmetic number, because the mean of its divisors is an integer number (321135547).

Almost surely, 2^642271093 is an apocalyptic number.

It is an amenable number.

642271093 is a deficient number, since it is larger than the sum of its proper divisors (1).

642271093 is an equidigital number, since it uses as much as digits as its factorization.

642271093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 642271093 is about 25343.0679476657. The cubic root of 642271093 is about 862.7920312796.

The spelling of 642271093 in words is "six hundred forty-two million, two hundred seventy-one thousand, ninety-three".