102171899 has 4 divisors (see below), whose sum is σ = 102214680. Its totient is φ = 102129120.

The previous prime is 102171871. The next prime is 102171907. The reversal of 102171899 is 998171201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102171899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102171829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17582 + ... + 22659.

It is an arithmetic number, because the mean of its divisors is an integer number (25553670).

Almost surely, 2^102171899 is an apocalyptic number.

102171899 is a deficient number, since it is larger than the sum of its proper divisors (42781).

102171899 is an equidigital number, since it uses as much as digits as its factorization.

102171899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42780.

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 102171899 is about 10108.0116244492. The cubic root of 102171899 is about 467.4951989365.

The spelling of 102171899 in words is "one hundred two million, one hundred seventy-one thousand, eight hundred ninety-nine".