102512409 has 4 divisors (see below), whose sum is σ = 136683216. Its totient is φ = 68341604.

The previous prime is 102512407. The next prime is 102512471. The reversal of 102512409 is 904215201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102512409 - 2¹ = 102512407 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (102512401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17085399 + ... + 17085404.

It is an arithmetic number, because the mean of its divisors is an integer number (34170804).

Almost surely, 2^102512409 is an apocalyptic number.

It is an amenable number.

102512409 is a deficient number, since it is larger than the sum of its proper divisors (34170807).

102512409 is an equidigital number, since it uses as much as digits as its factorization.

102512409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34170806.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 102512409 is about 10124.8411839396. The cubic root of 102512409 is about 468.0139660892.

The spelling of 102512409 in words is "one hundred two million, five hundred twelve thousand, four hundred nine".