128202931 has 2 divisors, whose sum is σ = 128202932. Its totient is φ = 128202930.

The previous prime is 128202911. The next prime is 128202973. The reversal of 128202931 is 139202821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128202931 - 2¹¹ = 128200883 is a prime.

It is a super-2 number, since 2×128202931² = 32871983033981522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128202931.

It is not a weakly prime, because it can be changed into another prime (128202911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64101465 + 64101466.

It is an arithmetic number, because the mean of its divisors is an integer number (64101466).

Almost surely, 2^128202931 is an apocalyptic number.

128202931 is a deficient number, since it is larger than the sum of its proper divisors (1).

128202931 is an equidigital number, since it uses as much as digits as its factorization.

128202931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 128202931 is about 11322.6733150789. The cubic root of 128202931 is about 504.2346095838.

It can be divided in two parts, 12820 and 2931, that added together give a palindrome (15751).

The spelling of 128202931 in words is "one hundred twenty-eight million, two hundred two thousand, nine hundred thirty-one".