102019643 has 4 divisors (see below), whose sum is σ = 111294168. Its totient is φ = 92745120.

The previous prime is 102019609. The next prime is 102019661. The reversal of 102019643 is 346910201.

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 102019643 - 2⁸ = 102019387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102019343) 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, 4637246 + ... + 4637267.

It is an arithmetic number, because the mean of its divisors is an integer number (27823542).

Almost surely, 2^102019643 is an apocalyptic number.

102019643 is a deficient number, since it is larger than the sum of its proper divisors (9274525).

102019643 is an equidigital number, since it uses as much as digits as its factorization.

102019643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9274524.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 102019643 is about 10100.4773649566. The cubic root of 102019643 is about 467.2628639016.

Adding to 102019643 its reverse (346910201), we get a palindrome (448929844).

The spelling of 102019643 in words is "one hundred two million, nineteen thousand, six hundred forty-three".