128661193 has 2 divisors, whose sum is σ = 128661194. Its totient is φ = 128661192.

The previous prime is 128661167. The next prime is 128661199. The reversal of 128661193 is 391166821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71098624 + 57562569 = 8432^2 + 7587^2 .

It is a cyclic number.

It is not a de Polignac number, because 128661193 - 2⁹ = 128660681 is a prime.

It is not a weakly prime, because it can be changed into another prime (128661199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64330596 + 64330597.

It is an arithmetic number, because the mean of its divisors is an integer number (64330597).

Almost surely, 2^128661193 is an apocalyptic number.

It is an amenable number.

128661193 is a deficient number, since it is larger than the sum of its proper divisors (1).

128661193 is an equidigital number, since it uses as much as digits as its factorization.

128661193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 128661193 is about 11342.8917388821. The cubic root of 128661193 is about 504.8346915064.

The spelling of 128661193 in words is "one hundred twenty-eight million, six hundred sixty-one thousand, one hundred ninety-three".