102249641 has 4 divisors (see below), whose sum is σ = 110115012. Its totient is φ = 94384272.

The previous prime is 102249629. The next prime is 102249649. The reversal of 102249641 is 146942201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47059600 + 55190041 = 6860^2 + 7429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102249641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102249649) 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, 3932666 + ... + 3932691.

It is an arithmetic number, because the mean of its divisors is an integer number (27528753).

Almost surely, 2^102249641 is an apocalyptic number.

It is an amenable number.

102249641 is a deficient number, since it is larger than the sum of its proper divisors (7865371).

102249641 is an equidigital number, since it uses as much as digits as its factorization.

102249641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7865370.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 102249641 is about 10111.8564566552. The cubic root of 102249641 is about 467.6137403294.

The spelling of 102249641 in words is "one hundred two million, two hundred forty-nine thousand, six hundred forty-one".