102171247 has 4 divisors (see below), whose sum is σ = 102242176. Its totient is φ = 102100320.

The previous prime is 102171233. The next prime is 102171283. The reversal of 102171247 is 742171201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 102171247 - 2²³ = 93782639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102171217) 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, 33258 + ... + 36199.

It is an arithmetic number, because the mean of its divisors is an integer number (25560544).

Almost surely, 2^102171247 is an apocalyptic number.

102171247 is a deficient number, since it is larger than the sum of its proper divisors (70929).

102171247 is an equidigital number, since it uses as much as digits as its factorization.

102171247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70928.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 102171247 is about 10107.9793727530. The cubic root of 102171247 is about 467.4942045094.

The spelling of 102171247 in words is "one hundred two million, one hundred seventy-one thousand, two hundred forty-seven".