102643915 has 16 divisors (see below), whose sum is σ = 134830080. Its totient is φ = 74394720.

The previous prime is 102643897. The next prime is 102643921. The reversal of 102643915 is 519346201.

It is not a de Polignac number, because 102643915 - 2²¹ = 100546763 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13846 + ... + 19924.

It is an arithmetic number, because the mean of its divisors is an integer number (8426880).

Almost surely, 2^102643915 is an apocalyptic number.

102643915 is a deficient number, since it is larger than the sum of its proper divisors (32186165).

102643915 is a wasteful number, since it uses less digits than its factorization.

102643915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6402.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 102643915 is about 10131.3333278498. Note that the first 4 decimals coincide. The cubic root of 102643915 is about 468.2140080353.

The spelling of 102643915 in words is "one hundred two million, six hundred forty-three thousand, nine hundred fifteen".