135778889 has 2 divisors, whose sum is σ = 135778890. Its totient is φ = 135778888.

The previous prime is 135778831. The next prime is 135778897. The reversal of 135778889 is 988877531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116812864 + 18966025 = 10808^2 + 4355^2 .

It is a cyclic number.

It is not a de Polignac number, because 135778889 - 2¹⁶ = 135713353 is a prime.

It is a Chen prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (135778189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67889444 + 67889445.

It is an arithmetic number, because the mean of its divisors is an integer number (67889445).

Almost surely, 2^135778889 is an apocalyptic number.

It is an amenable number.

135778889 is a deficient number, since it is larger than the sum of its proper divisors (1).

135778889 is an equidigital number, since it uses as much as digits as its factorization.

135778889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 56.

The square root of 135778889 is about 11652.4198774332. The cubic root of 135778889 is about 513.9774715456.

The spelling of 135778889 in words is "one hundred thirty-five million, seven hundred seventy-eight thousand, eight hundred eighty-nine".