128601731 has 2 divisors, whose sum is σ = 128601732. Its totient is φ = 128601730.

The previous prime is 128601703. The next prime is 128601791. The reversal of 128601731 is 137106821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128601731 - 2²² = 124407427 is a prime.

It is a super-2 number, since 2×128601731² = 33076810432392722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128601694 and 128601703.

It is not a weakly prime, because it can be changed into another prime (128601791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64300865 + 64300866.

It is an arithmetic number, because the mean of its divisors is an integer number (64300866).

Almost surely, 2^128601731 is an apocalyptic number.

128601731 is a deficient number, since it is larger than the sum of its proper divisors (1).

128601731 is an equidigital number, since it uses as much as digits as its factorization.

128601731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 128601731 is about 11340.2703230567. The cubic root of 128601731 is about 504.7569081299.

The spelling of 128601731 in words is "one hundred twenty-eight million, six hundred one thousand, seven hundred thirty-one".