128242693 has 2 divisors, whose sum is σ = 128242694. Its totient is φ = 128242692.

The previous prime is 128242657. The next prime is 128242717. The reversal of 128242693 is 396242821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126495009 + 1747684 = 11247^2 + 1322^2 .

It is a cyclic number.

It is not a de Polignac number, because 128242693 - 2²⁵ = 94688261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128242193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64121346 + 64121347.

It is an arithmetic number, because the mean of its divisors is an integer number (64121347).

Almost surely, 2^128242693 is an apocalyptic number.

It is an amenable number.

128242693 is a deficient number, since it is larger than the sum of its proper divisors (1).

128242693 is an equidigital number, since it uses as much as digits as its factorization.

128242693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 37.

The square root of 128242693 is about 11324.4290363797. The cubic root of 128242693 is about 504.2867334679.

The spelling of 128242693 in words is "one hundred twenty-eight million, two hundred forty-two thousand, six hundred ninety-three".