128714561 has 2 divisors, whose sum is σ = 128714562. Its totient is φ = 128714560.

The previous prime is 128714543. The next prime is 128714563. The reversal of 128714561 is 165417821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117592336 + 11122225 = 10844^2 + 3335^2 .

It is a cyclic number.

It is not a de Polignac number, because 128714561 - 2²⁶ = 61605697 is a prime.

Together with 128714563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128714563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64357280 + 64357281.

It is an arithmetic number, because the mean of its divisors is an integer number (64357281).

Almost surely, 2^128714561 is an apocalyptic number.

It is an amenable number.

128714561 is a deficient number, since it is larger than the sum of its proper divisors (1).

128714561 is an equidigital number, since it uses as much as digits as its factorization.

128714561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 35.

The square root of 128714561 is about 11345.2439815105. The cubic root of 128714561 is about 504.9044828007.

The spelling of 128714561 in words is "one hundred twenty-eight million, seven hundred fourteen thousand, five hundred sixty-one".