128547431 has 2 divisors, whose sum is σ = 128547432. Its totient is φ = 128547430.

The previous prime is 128547427. The next prime is 128547443. The reversal of 128547431 is 134745821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128547431 - 2² = 128547427 is a prime.

It is a super-2 number, since 2×128547431² = 33048884033399522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128547391 and 128547400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128547451) 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 as a sum of consecutive naturals, namely, 64273715 + 64273716.

It is an arithmetic number, because the mean of its divisors is an integer number (64273716).

Almost surely, 2^128547431 is an apocalyptic number.

128547431 is a deficient number, since it is larger than the sum of its proper divisors (1).

128547431 is an equidigital number, since it uses as much as digits as its factorization.

128547431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 35.

The square root of 128547431 is about 11337.8759474604. The cubic root of 128547431 is about 504.6858563165.

The spelling of 128547431 in words is "one hundred twenty-eight million, five hundred forty-seven thousand, four hundred thirty-one".