28131319 has 2 divisors, whose sum is σ = 28131320. Its totient is φ = 28131318.

The previous prime is 28131307. The next prime is 28131329. The reversal of 28131319 is 91313182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28131319 - 2⁹ = 28130807 is a prime.

It is a super-2 number, since 2×28131319² = 1582742217359522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28131329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14065659 + 14065660.

It is an arithmetic number, because the mean of its divisors is an integer number (14065660).

Almost surely, 2^28131319 is an apocalyptic number.

28131319 is a deficient number, since it is larger than the sum of its proper divisors (1).

28131319 is an equidigital number, since it uses as much as digits as its factorization.

28131319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 28131319 is about 5303.8965864730. The cubic root of 28131319 is about 304.1328734417.

The spelling of 28131319 in words is "twenty-eight million, one hundred thirty-one thousand, three hundred nineteen".