102509138 has 8 divisors (see below), whose sum is σ = 153845580. Its totient is φ = 51227280.

The previous prime is 102509101. The next prime is 102509149. The reversal of 102509138 is 831905201.

It can be written as a sum of positive squares in 2 ways, for example, as 100540729 + 1968409 = 10027^2 + 1403^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 102509138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8573 + ... + 16688.

Almost surely, 2^102509138 is an apocalyptic number.

102509138 is a deficient number, since it is larger than the sum of its proper divisors (51336442).

102509138 is a wasteful number, since it uses less digits than its factorization.

102509138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27292.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 102509138 is about 10124.6796492531. The cubic root of 102509138 is about 468.0089881879.

The spelling of 102509138 in words is "one hundred two million, five hundred nine thousand, one hundred thirty-eight".