102008645 has 4 divisors (see below), whose sum is σ = 122410380. Its totient is φ = 81606912.

The previous prime is 102008633. The next prime is 102008651. The reversal of 102008645 is 546800201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546800201 = 971 ⋅563131.

It can be written as a sum of positive squares in 2 ways, for example, as 48455521 + 53553124 = 6961^2 + 7318^2 .

It is a cyclic number.

It is not a de Polignac number, because 102008645 - 2¹² = 102004549 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 10200860 + ... + 10200869.

It is an arithmetic number, because the mean of its divisors is an integer number (30602595).

Almost surely, 2^102008645 is an apocalyptic number.

It is an amenable number.

102008645 is a deficient number, since it is larger than the sum of its proper divisors (20401735).

102008645 is an equidigital number, since it uses as much as digits as its factorization.

102008645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20401734.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 102008645 is about 10099.9329205693. The cubic root of 102008645 is about 467.2460725547.

Adding to 102008645 its reverse (546800201), we get a palindrome (648808846).

The spelling of 102008645 in words is "one hundred two million, eight thousand, six hundred forty-five".