128497331 has 2 divisors, whose sum is σ = 128497332. Its totient is φ = 128497330.

The previous prime is 128497309. The next prime is 128497333. The reversal of 128497331 is 133794821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128497331 - 2⁶ = 128497267 is a prime.

It is a super-2 number, since 2×128497331² = 33023128148247122, which contains 22 as substring.

Together with 128497333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128497333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64248665 + 64248666.

It is an arithmetic number, because the mean of its divisors is an integer number (64248666).

Almost surely, 2^128497331 is an apocalyptic number.

128497331 is a deficient number, since it is larger than the sum of its proper divisors (1).

128497331 is an equidigital number, since it uses as much as digits as its factorization.

128497331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 128497331 is about 11335.6663236000. Note that the first 3 decimals coincide. The cubic root of 128497331 is about 504.6202824741.

The spelling of 128497331 in words is "one hundred twenty-eight million, four hundred ninety-seven thousand, three hundred thirty-one".