128346931 has 2 divisors, whose sum is σ = 128346932. Its totient is φ = 128346930.

The previous prime is 128346899. The next prime is 128346937. The reversal of 128346931 is 139643821.

It is a strong prime.

It is an emirp because it is prime and its reverse (139643821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128346931 - 2⁵ = 128346899 is a prime.

It is a super-2 number, since 2×128346931² = 32945869394237522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128346937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64173465 + 64173466.

It is an arithmetic number, because the mean of its divisors is an integer number (64173466).

Almost surely, 2^128346931 is an apocalyptic number.

128346931 is a deficient number, since it is larger than the sum of its proper divisors (1).

128346931 is an equidigital number, since it uses as much as digits as its factorization.

128346931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 128346931 is about 11329.0304527793. The cubic root of 128346931 is about 504.4233276175.

The spelling of 128346931 in words is "one hundred twenty-eight million, three hundred forty-six thousand, nine hundred thirty-one".