121138789 has 2 divisors, whose sum is σ = 121138790. Its totient is φ = 121138788.

The previous prime is 121138781. The next prime is 121138807. The reversal of 121138789 is 987831121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118048225 + 3090564 = 10865^2 + 1758^2 .

It is a cyclic number.

It is not a de Polignac number, because 121138789 - 2³ = 121138781 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 (121138781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60569394 + 60569395.

It is an arithmetic number, because the mean of its divisors is an integer number (60569395).

Almost surely, 2^121138789 is an apocalyptic number.

It is an amenable number.

121138789 is a deficient number, since it is larger than the sum of its proper divisors (1).

121138789 is an equidigital number, since it uses as much as digits as its factorization.

121138789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 40.

The square root of 121138789 is about 11006.3067829313. The cubic root of 121138789 is about 494.7977802026.

It can be divided in two parts, 12113 and 8789, that added together give a palindrome (20902).

The spelling of 121138789 in words is "one hundred twenty-one million, one hundred thirty-eight thousand, seven hundred eighty-nine".