102649 has 4 divisors (see below), whose sum is σ = 107136. Its totient is φ = 98164.

The previous prime is 102647. The next prime is 102653. The reversal of 102649 is 946201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 102649 - 2¹ = 102647 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2209 + ... + 2254.

It is an arithmetic number, because the mean of its divisors is an integer number (26784).

2¹⁰²⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

102649 is a deficient number, since it is larger than the sum of its proper divisors (4487).

102649 is an equidigital number, since it uses as much as digits as its factorization.

102649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4486.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 102649 is about 320.3888262721. The cubic root of 102649 is about 46.8221739713.

The spelling of 102649 in words is "one hundred two thousand, six hundred forty-nine".