102549139 has 16 divisors (see below), whose sum is σ = 130026240. Its totient is φ = 78550560.

The previous prime is 102549131. The next prime is 102549143. The reversal of 102549139 is 931945201.

It is not a de Polignac number, because 102549139 - 2³ = 102549131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102549131) 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 15 ways as a sum of consecutive naturals, for example, 6744 + ... + 15829.

It is an arithmetic number, because the mean of its divisors is an integer number (8126640).

Almost surely, 2^102549139 is an apocalyptic number.

102549139 is a deficient number, since it is larger than the sum of its proper divisors (27477101).

102549139 is a wasteful number, since it uses less digits than its factorization.

102549139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22650.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 102549139 is about 10126.6548771053. The cubic root of 102549139 is about 468.0698555842.

The spelling of 102549139 in words is "one hundred two million, five hundred forty-nine thousand, one hundred thirty-nine".