102019849 has 4 divisors (see below), whose sum is σ = 104508180. Its totient is φ = 99531520.

The previous prime is 102019843. The next prime is 102019867. The reversal of 102019849 is 948910201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 948910201 = 4703 ⋅201767.

It can be written as a sum of positive squares in 2 ways, for example, as 8065600 + 93954249 = 2840^2 + 9693^2 .

It is a cyclic number.

It is not a de Polignac number, because 102019849 - 2⁵ = 102019817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102019843) by changing a digit.

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, 1244104 + ... + 1244185.

It is an arithmetic number, because the mean of its divisors is an integer number (26127045).

Almost surely, 2^102019849 is an apocalyptic number.

It is an amenable number.

102019849 is a deficient number, since it is larger than the sum of its proper divisors (2488331).

102019849 is an equidigital number, since it uses as much as digits as its factorization.

102019849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488330.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 102019849 is about 10100.4875624892. The cubic root of 102019849 is about 467.2631784034.

The spelling of 102019849 in words is "one hundred two million, nineteen thousand, eight hundred forty-nine".