642481093 has 2 divisors, whose sum is σ = 642481094. Its totient is φ = 642481092.

The previous prime is 642481079. The next prime is 642481127. The reversal of 642481093 is 390184246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642267649 + 213444 = 25343^2 + 462^2 .

It is a cyclic number.

It is not a de Polignac number, because 642481093 - 2¹⁷ = 642350021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642481043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321240546 + 321240547.

It is an arithmetic number, because the mean of its divisors is an integer number (321240547).

Almost surely, 2^642481093 is an apocalyptic number.

It is an amenable number.

642481093 is a deficient number, since it is larger than the sum of its proper divisors (1).

642481093 is an equidigital number, since it uses as much as digits as its factorization.

642481093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 642481093 is about 25347.2107538482. The cubic root of 642481093 is about 862.8860552231.

It can be divided in two parts, 64248 and 1093, that added together give a triangular number (65341 = T₃₆₁).

The spelling of 642481093 in words is "six hundred forty-two million, four hundred eighty-one thousand, ninety-three".