102275645 has 4 divisors (see below), whose sum is σ = 122730780. Its totient is φ = 81820512.

The previous prime is 102275639. The next prime is 102275647. The reversal of 102275645 is 546572201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546572201 = 7 ⋅78081743.

It can be written as a sum of positive squares in 2 ways, for example, as 55517401 + 46758244 = 7451^2 + 6838^2 .

It is a cyclic number.

It is not a de Polignac number, because 102275645 - 2⁸ = 102275389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102275647) 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, 10227560 + ... + 10227569.

It is an arithmetic number, because the mean of its divisors is an integer number (30682695).

Almost surely, 2^102275645 is an apocalyptic number.

It is an amenable number.

102275645 is a deficient number, since it is larger than the sum of its proper divisors (20455135).

102275645 is an equidigital number, since it uses as much as digits as its factorization.

102275645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20455134.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 102275645 is about 10113.1421922170. The cubic root of 102275645 is about 467.6533779486.

It can be divided in two parts, 1022 and 75645, that added together give a palindrome (76667).

The spelling of 102275645 in words is "one hundred two million, two hundred seventy-five thousand, six hundred forty-five".