128737081 has 4 divisors (see below), whose sum is σ = 140440464. Its totient is φ = 117033700.

The previous prime is 128737069. The next prime is 128737087. The reversal of 128737081 is 180737821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128737081 - 2¹⁵ = 128704313 is a prime.

It is a super-2 number, since 2×128737081² = 33146472048801122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128737081.

It is not an unprimeable number, because it can be changed into a prime (128737087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5851675 + ... + 5851696.

It is an arithmetic number, because the mean of its divisors is an integer number (35110116).

Almost surely, 2^128737081 is an apocalyptic number.

128737081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128737081 is a deficient number, since it is larger than the sum of its proper divisors (11703383).

128737081 is a wasteful number, since it uses less digits than its factorization.

128737081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11703382.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 128737081 is about 11346.2364244713. The cubic root of 128737081 is about 504.9339272442.

The spelling of 128737081 in words is "one hundred twenty-eight million, seven hundred thirty-seven thousand, eighty-one".