28531270331 has 2 divisors, whose sum is σ = 28531270332. Its totient is φ = 28531270330.

The previous prime is 28531270321. The next prime is 28531270379. The reversal of 28531270331 is 13307213582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28531270331 - 2²² = 28527076027 is a prime.

It is a super-2 number, since 2×28531270331² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28531270291 and 28531270300.

It is not a weakly prime, because it can be changed into another prime (28531270301) 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, 14265635165 + 14265635166.

It is an arithmetic number, because the mean of its divisors is an integer number (14265635166).

Almost surely, 2^28531270331 is an apocalyptic number.

28531270331 is a deficient number, since it is larger than the sum of its proper divisors (1).

28531270331 is an equidigital number, since it uses as much as digits as its factorization.

28531270331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 28531270331 in words is "twenty-eight billion, five hundred thirty-one million, two hundred seventy thousand, three hundred thirty-one".