102639515 has 16 divisors (see below), whose sum is σ = 136571616. Its totient is φ = 73420800.

The previous prime is 102639491. The next prime is 102639521. The reversal of 102639515 is 515936201.

It is not a de Polignac number, because 102639515 - 2⁸ = 102639259 is a prime.

It is a Duffinian number.

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, 11942 + ... + 18651.

It is an arithmetic number, because the mean of its divisors is an integer number (8535726).

Almost surely, 2^102639515 is an apocalyptic number.

102639515 is a deficient number, since it is larger than the sum of its proper divisors (33932101).

102639515 is a wasteful number, since it uses less digits than its factorization.

102639515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30670.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 102639515 is about 10131.1161774012. The cubic root of 102639515 is about 468.2073176856.

The spelling of 102639515 in words is "one hundred two million, six hundred thirty-nine thousand, five hundred fifteen".