102090749 has 2 divisors, whose sum is σ = 102090750. Its totient is φ = 102090748.

The previous prime is 102090739. The next prime is 102090787. The reversal of 102090749 is 947090201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75568249 + 26522500 = 8693^2 + 5150^2 .

It is a cyclic number.

It is not a de Polignac number, because 102090749 - 2⁸ = 102090493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102090739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51045374 + 51045375.

It is an arithmetic number, because the mean of its divisors is an integer number (51045375).

Almost surely, 2^102090749 is an apocalyptic number.

It is an amenable number.

102090749 is a deficient number, since it is larger than the sum of its proper divisors (1).

102090749 is an equidigital number, since it uses as much as digits as its factorization.

102090749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 102090749 is about 10103.9966844808. The cubic root of 102090749 is about 467.3713968471.

The spelling of 102090749 in words is "one hundred two million, ninety thousand, seven hundred forty-nine".