28125431 has 2 divisors, whose sum is σ = 28125432. Its totient is φ = 28125430.

The previous prime is 28125421. The next prime is 28125437. The reversal of 28125431 is 13452182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28125431 - 2¹⁰ = 28124407 is a prime.

It is a super-2 number, since 2×28125431² = 1582079737871522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28125431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28125437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14062715 + 14062716.

It is an arithmetic number, because the mean of its divisors is an integer number (14062716).

Almost surely, 2^28125431 is an apocalyptic number.

28125431 is a deficient number, since it is larger than the sum of its proper divisors (1).

28125431 is an equidigital number, since it uses as much as digits as its factorization.

28125431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 26.

The square root of 28125431 is about 5303.3414938131. The cubic root of 28125431 is about 304.1116532102. Note that the first 3 decimals are identical.

The spelling of 28125431 in words is "twenty-eight million, one hundred twenty-five thousand, four hundred thirty-one".