128940140741 has 2 divisors, whose sum is σ = 128940140742. Its totient is φ = 128940140740.

The previous prime is 128940140723. The next prime is 128940140789. The reversal of 128940140741 is 147041049821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95941965025 + 32998175716 = 309745^2 + 181654^2 .

It is an emirp because it is prime and its reverse (147041049821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128940140741 - 2³⁰ = 127866398917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128940143741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64470070370 + 64470070371.

It is an arithmetic number, because the mean of its divisors is an integer number (64470070371).

Almost surely, 2^128940140741 is an apocalyptic number.

It is an amenable number.

128940140741 is a deficient number, since it is larger than the sum of its proper divisors (1).

128940140741 is an equidigital number, since it uses as much as digits as its factorization.

128940140741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 128940140741 in words is "one hundred twenty-eight billion, nine hundred forty million, one hundred forty thousand, seven hundred forty-one".