128380537 has 2 divisors, whose sum is σ = 128380538. Its totient is φ = 128380536.

The previous prime is 128380513. The next prime is 128380541. The reversal of 128380537 is 735083821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113550336 + 14830201 = 10656^2 + 3851^2 .

It is a cyclic number.

It is not a de Polignac number, because 128380537 - 2¹⁹ = 127856249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128380496 and 128380505.

It is not a weakly prime, because it can be changed into another prime (128380597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64190268 + 64190269.

It is an arithmetic number, because the mean of its divisors is an integer number (64190269).

Almost surely, 2^128380537 is an apocalyptic number.

It is an amenable number.

128380537 is a deficient number, since it is larger than the sum of its proper divisors (1).

128380537 is an equidigital number, since it uses as much as digits as its factorization.

128380537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 128380537 is about 11330.5135364643. The cubic root of 128380537 is about 504.4673493714.

The spelling of 128380537 in words is "one hundred twenty-eight million, three hundred eighty thousand, five hundred thirty-seven".