128241737 has 4 divisors (see below), whose sum is σ = 138106500. Its totient is φ = 118376976.

The previous prime is 128241731. The next prime is 128241749. The reversal of 128241737 is 737142821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64577296 + 63664441 = 8036^2 + 7979^2 .

It is a cyclic number.

It is not a de Polignac number, because 128241737 - 2¹⁰ = 128240713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128241697 and 128241706.

It is not an unprimeable number, because it can be changed into a prime (128241731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4932362 + ... + 4932387.

It is an arithmetic number, because the mean of its divisors is an integer number (34526625).

Almost surely, 2^128241737 is an apocalyptic number.

It is an amenable number.

128241737 is a deficient number, since it is larger than the sum of its proper divisors (9864763).

128241737 is an equidigital number, since it uses as much as digits as its factorization.

128241737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9864762.

The product of its digits is 18816, while the sum is 35.

The square root of 128241737 is about 11324.3868266675. The cubic root of 128241737 is about 504.2854803768.

The spelling of 128241737 in words is "one hundred twenty-eight million, two hundred forty-one thousand, seven hundred thirty-seven".