121758089 has 2 divisors, whose sum is σ = 121758090. Its totient is φ = 121758088.

The previous prime is 121758079. The next prime is 121758101. The reversal of 121758089 is 980857121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118810000 + 2948089 = 10900^2 + 1717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121758089 is a prime.

It is not a weakly prime, because it can be changed into another prime (121758079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60879044 + 60879045.

It is an arithmetic number, because the mean of its divisors is an integer number (60879045).

Almost surely, 2^121758089 is an apocalyptic number.

It is an amenable number.

121758089 is a deficient number, since it is larger than the sum of its proper divisors (1).

121758089 is an equidigital number, since it uses as much as digits as its factorization.

121758089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 121758089 is about 11034.4047868474. The cubic root of 121758089 is about 495.6395352386.

The spelling of 121758089 in words is "one hundred twenty-one million, seven hundred fifty-eight thousand, eighty-nine".