128535381 has 12 divisors (see below), whose sum is σ = 199944108. Its totient is φ = 79098624.

The previous prime is 128535359. The next prime is 128535383. The reversal of 128535381 is 183535821.

It can be written as a sum of positive squares in 2 ways, for example, as 87048900 + 41486481 = 9330^2 + 6441^2 .

It is not a de Polignac number, because 128535381 - 2⁵ = 128535349 is a prime.

It is a super-2 number, since 2×128535381² = 33042688337630322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128535383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 549180 + ... + 549413.

It is an arithmetic number, because the mean of its divisors is an integer number (16662009).

Almost surely, 2^128535381 is an apocalyptic number.

It is an amenable number.

128535381 is a deficient number, since it is larger than the sum of its proper divisors (71408727).

128535381 is a wasteful number, since it uses less digits than its factorization.

128535381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098612 (or 1098609 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 128535381 is about 11337.3445303563. The cubic root of 128535381 is about 504.6700861203.

The spelling of 128535381 in words is "one hundred twenty-eight million, five hundred thirty-five thousand, three hundred eighty-one".