102690449 has 2 divisors, whose sum is σ = 102690450. Its totient is φ = 102690448.

The previous prime is 102690443. The next prime is 102690451. The reversal of 102690449 is 944096201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97377424 + 5313025 = 9868^2 + 2305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102690449 is a prime.

Together with 102690451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102690443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51345224 + 51345225.

It is an arithmetic number, because the mean of its divisors is an integer number (51345225).

Almost surely, 2^102690449 is an apocalyptic number.

It is an amenable number.

102690449 is a deficient number, since it is larger than the sum of its proper divisors (1).

102690449 is an equidigital number, since it uses as much as digits as its factorization.

102690449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 102690449 is about 10133.6296064145. The cubic root of 102690449 is about 468.2847528653.

The spelling of 102690449 in words is "one hundred two million, six hundred ninety thousand, four hundred forty-nine".