102039217 has 12 divisors (see below), whose sum is σ = 118878516. Its totient is φ = 87329760.

The previous prime is 102039173. The next prime is 102039221. The reversal of 102039217 is 712930201.

It can be written as a sum of positive squares in 2 ways, for example, as 88378801 + 13660416 = 9401^2 + 3696^2 .

It is not a de Polignac number, because 102039217 - 2⁷ = 102039089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102039191 and 102039200.

It is not an unprimeable number, because it can be changed into a prime (102039277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45003 + ... + 47215.

It is an arithmetic number, because the mean of its divisors is an integer number (9906543).

Almost surely, 2^102039217 is an apocalyptic number.

It is an amenable number.

102039217 is a deficient number, since it is larger than the sum of its proper divisors (16839299).

102039217 is an equidigital number, since it uses as much as digits as its factorization.

102039217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3168 (or 3161 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 102039217 is about 10101.4462825875. The cubic root of 102039217 is about 467.2927457889.

Adding to 102039217 its reverse (712930201), we get a palindrome (814969418).

The spelling of 102039217 in words is "one hundred two million, thirty-nine thousand, two hundred seventeen".