102015643 has 4 divisors (see below), whose sum is σ = 102265480. Its totient is φ = 101765808.

The previous prime is 102015631. The next prime is 102015647. The reversal of 102015643 is 346510201.

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 102015643 - 2⁵ = 102015611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102015647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124305 + ... + 125122.

It is an arithmetic number, because the mean of its divisors is an integer number (25566370).

Almost surely, 2^102015643 is an apocalyptic number.

102015643 is a deficient number, since it is larger than the sum of its proper divisors (249837).

102015643 is an equidigital number, since it uses as much as digits as its factorization.

102015643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249836.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 102015643 is about 10100.2793525724. The cubic root of 102015643 is about 467.2567569866.

Adding to 102015643 its reverse (346510201), we get a palindrome (448525844).

The spelling of 102015643 in words is "one hundred two million, fifteen thousand, six hundred forty-three".