102042209 has 2 divisors, whose sum is σ = 102042210. Its totient is φ = 102042208.

The previous prime is 102042197. The next prime is 102042221. The reversal of 102042209 is 902240201.

It is a balanced prime because it is at equal distance from previous prime (102042197) and next prime (102042221).

It can be written as a sum of positive squares in only one way, i.e., 56776225 + 45265984 = 7535^2 + 6728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102042209 is a prime.

It is a super-2 number, since 2×102042209² = 20825224835199362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (102042299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51021104 + 51021105.

It is an arithmetic number, because the mean of its divisors is an integer number (51021105).

Almost surely, 2^102042209 is an apocalyptic number.

It is an amenable number.

102042209 is a deficient number, since it is larger than the sum of its proper divisors (1).

102042209 is an equidigital number, since it uses as much as digits as its factorization.

102042209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 102042209 is about 10101.5943791067. The cubic root of 102042209 is about 467.2973130729.

The spelling of 102042209 in words is "one hundred two million, forty-two thousand, two hundred nine".