128936173 has 2 divisors, whose sum is σ = 128936174. Its totient is φ = 128936172.

The previous prime is 128936153. The next prime is 128936189. The reversal of 128936173 is 371639821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101666889 + 27269284 = 10083^2 + 5222^2 .

It is a cyclic number.

It is not a de Polignac number, because 128936173 - 2⁹ = 128935661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128936153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64468086 + 64468087.

It is an arithmetic number, because the mean of its divisors is an integer number (64468087).

Almost surely, 2^128936173 is an apocalyptic number.

It is an amenable number.

128936173 is a deficient number, since it is larger than the sum of its proper divisors (1).

128936173 is an equidigital number, since it uses as much as digits as its factorization.

128936173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 128936173 is about 11355.0065169510. The cubic root of 128936173 is about 505.1940867538.

The spelling of 128936173 in words is "one hundred twenty-eight million, nine hundred thirty-six thousand, one hundred seventy-three".