102005251 has 4 divisors (see below), whose sum is σ = 102690000. Its totient is φ = 101320504.

The previous prime is 102005191. The next prime is 102005261. The reversal of 102005251 is 152500201.

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 102005251 - 2⁹ = 102004739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102005261) 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 3 ways as a sum of consecutive naturals, for example, 342151 + ... + 342448.

It is an arithmetic number, because the mean of its divisors is an integer number (25672500).

Almost surely, 2^102005251 is an apocalyptic number.

102005251 is a deficient number, since it is larger than the sum of its proper divisors (684749).

102005251 is an equidigital number, since it uses as much as digits as its factorization.

102005251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684748.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 102005251 is about 10099.7648982538. The cubic root of 102005251 is about 467.2408904751.

Adding to 102005251 its reverse (152500201), we get a palindrome (254505452).

It can be divided in two parts, 10200 and 5251, that added together give a palindrome (15451).

The spelling of 102005251 in words is "one hundred two million, five thousand, two hundred fifty-one".