102187009 has 2 divisors, whose sum is σ = 102187010. Its totient is φ = 102187008.

The previous prime is 102187003. The next prime is 102187013. The reversal of 102187009 is 900781201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97456384 + 4730625 = 9872^2 + 2175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102187009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102187003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51093504 + 51093505.

It is an arithmetic number, because the mean of its divisors is an integer number (51093505).

It is a Proth number, since it is equal to 6237 ⋅ 2¹⁴ + 1 and 6237 < 2¹⁴.

Almost surely, 2^102187009 is an apocalyptic number.

It is an amenable number.

102187009 is a deficient number, since it is larger than the sum of its proper divisors (1).

102187009 is an equidigital number, since it uses as much as digits as its factorization.

102187009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 102187009 is about 10108.7590237378. The cubic root of 102187009 is about 467.5182434472.

The spelling of 102187009 in words is "one hundred two million, one hundred eighty-seven thousand, nine".