102019645 has 32 divisors (see below), whose sum is σ = 158618880. Its totient is φ = 61171200.

The previous prime is 102019609. The next prime is 102019661. The reversal of 102019645 is 546910201.

102019645 = 130² + 131² + ... + 675².

It is not a de Polignac number, because 102019645 - 2⁷ = 102019517 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 (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2745 + ... + 14545.

It is an arithmetic number, because the mean of its divisors is an integer number (4956840).

Almost surely, 2^102019645 is an apocalyptic number.

It is an amenable number.

102019645 is a deficient number, since it is larger than the sum of its proper divisors (56599235).

102019645 is a wasteful number, since it uses less digits than its factorization.

102019645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11845.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 102019645 is about 10100.4774639618. The cubic root of 102019645 is about 467.2628669551.

Adding to 102019645 its reverse (546910201), we get a palindrome (648929846).

The spelling of 102019645 in words is "one hundred two million, nineteen thousand, six hundred forty-five".