102129149 has 4 divisors (see below), whose sum is σ = 108136764. Its totient is φ = 96121536.

The previous prime is 102129143. The next prime is 102129173. The reversal of 102129149 is 941921201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 941921201 = 13 ⋅72455477.

It can be written as a sum of positive squares in 2 ways, for example, as 95844100 + 6285049 = 9790^2 + 2507^2 .

It is not a de Polignac number, because 102129149 - 2⁴ = 102129133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102129143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3003782 + ... + 3003815.

It is an arithmetic number, because the mean of its divisors is an integer number (27034191).

Almost surely, 2^102129149 is an apocalyptic number.

It is an amenable number.

102129149 is a deficient number, since it is larger than the sum of its proper divisors (6007615).

102129149 is an equidigital number, since it uses as much as digits as its factorization.

102129149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6007614.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 102129149 is about 10105.8967439807. The cubic root of 102129149 is about 467.4299878951.

The spelling of 102129149 in words is "one hundred two million, one hundred twenty-nine thousand, one hundred forty-nine".