102121489 has 2 divisors, whose sum is σ = 102121490. Its totient is φ = 102121488.

The previous prime is 102121463. The next prime is 102121519. The reversal of 102121489 is 984121201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53582400 + 48539089 = 7320^2 + 6967^2 .

It is a cyclic number.

It is not a de Polignac number, because 102121489 - 2⁷ = 102121361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102121189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060744 + 51060745.

It is an arithmetic number, because the mean of its divisors is an integer number (51060745).

Almost surely, 2^102121489 is an apocalyptic number.

It is an amenable number.

102121489 is a deficient number, since it is larger than the sum of its proper divisors (1).

102121489 is an equidigital number, since it uses as much as digits as its factorization.

102121489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 102121489 is about 10105.5177502194. The cubic root of 102121489 is about 467.4183013745.

The spelling of 102121489 in words is "one hundred two million, one hundred twenty-one thousand, four hundred eighty-nine".