102921649 has 2 divisors, whose sum is σ = 102921650. Its totient is φ = 102921648.

The previous prime is 102921641. The next prime is 102921653. The reversal of 102921649 is 946129201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52056225 + 50865424 = 7215^2 + 7132^2 .

It is a cyclic number.

It is not a de Polignac number, because 102921649 - 2³ = 102921641 is a prime.

It is not a weakly prime, because it can be changed into another prime (102921641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51460824 + 51460825.

It is an arithmetic number, because the mean of its divisors is an integer number (51460825).

Almost surely, 2^102921649 is an apocalyptic number.

It is an amenable number.

102921649 is a deficient number, since it is larger than the sum of its proper divisors (1).

102921649 is an equidigital number, since it uses as much as digits as its factorization.

102921649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 102921649 is about 10145.0307540194. The cubic root of 102921649 is about 468.6359256872.

The spelling of 102921649 in words is "one hundred two million, nine hundred twenty-one thousand, six hundred forty-nine".