128623741 has 2 divisors, whose sum is σ = 128623742. Its totient is φ = 128623740.

The previous prime is 128623727. The next prime is 128623769. The reversal of 128623741 is 147326821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123543225 + 5080516 = 11115^2 + 2254^2 .

It is an emirp because it is prime and its reverse (147326821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128623741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128623697 and 128623706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128623541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64311870 + 64311871.

It is an arithmetic number, because the mean of its divisors is an integer number (64311871).

Almost surely, 2^128623741 is an apocalyptic number.

It is an amenable number.

128623741 is a deficient number, since it is larger than the sum of its proper divisors (1).

128623741 is an equidigital number, since it uses as much as digits as its factorization.

128623741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 128623741 is about 11341.2407169586. The cubic root of 128623741 is about 504.7857026252.

The spelling of 128623741 in words is "one hundred twenty-eight million, six hundred twenty-three thousand, seven hundred forty-one".