102140609 has 12 divisors (see below), whose sum is σ = 107469396. Its totient is φ = 97003872.

The previous prime is 102140603. The next prime is 102140617. The reversal of 102140609 is 906041201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 90307009 + 11833600 = 9503^2 + 3440^2 .

It is not a de Polignac number, because 102140609 - 2²⁴ = 85363393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (102140603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67667 + ... + 69159.

It is an arithmetic number, because the mean of its divisors is an integer number (8955783).

Almost surely, 2^102140609 is an apocalyptic number.

It is an amenable number.

102140609 is a deficient number, since it is larger than the sum of its proper divisors (5328787).

102140609 is an equidigital number, since it uses as much as digits as its factorization.

102140609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616 (or 1573 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 102140609 is about 10106.4637237760. The cubic root of 102140609 is about 467.4474708154.

The spelling of 102140609 in words is "one hundred two million, one hundred forty thousand, six hundred nine".