128936473 has 2 divisors, whose sum is σ = 128936474. Its totient is φ = 128936472.

The previous prime is 128936461. The next prime is 128936477. The reversal of 128936473 is 374639821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105925264 + 23011209 = 10292^2 + 4797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128936473 is a prime.

It is a super-2 number, since 2×128936473² = 33249228139359458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128936477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64468236 + 64468237.

It is an arithmetic number, because the mean of its divisors is an integer number (64468237).

Almost surely, 2^128936473 is an apocalyptic number.

It is an amenable number.

128936473 is a deficient number, since it is larger than the sum of its proper divisors (1).

128936473 is an equidigital number, since it uses as much as digits as its factorization.

128936473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 128936473 is about 11355.0197269754. The cubic root of 128936473 is about 505.1944785707.

The spelling of 128936473 in words is "one hundred twenty-eight million, nine hundred thirty-six thousand, four hundred seventy-three".