209140093 has 2 divisors, whose sum is σ = 209140094. Its totient is φ = 209140092.

The previous prime is 209140091. The next prime is 209140123. The reversal of 209140093 is 390041902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185695129 + 23444964 = 13627^2 + 4842^2 .

It is a cyclic number.

It is not a de Polignac number, because 209140093 - 2¹ = 209140091 is a prime.

Together with 209140091, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209140091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104570046 + 104570047.

It is an arithmetic number, because the mean of its divisors is an integer number (104570047).

Almost surely, 2^209140093 is an apocalyptic number.

It is an amenable number.

209140093 is a deficient number, since it is larger than the sum of its proper divisors (1).

209140093 is an equidigital number, since it uses as much as digits as its factorization.

209140093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 209140093 is about 14461.6767008532. The cubic root of 209140093 is about 593.5797805977.

Adding to 209140093 its reverse (390041902), we get a palindrome (599181995).

The spelling of 209140093 in words is "two hundred nine million, one hundred forty thousand, ninety-three".