28431031 has 2 divisors, whose sum is σ = 28431032. Its totient is φ = 28431030.

The previous prime is 28431019. The next prime is 28431071. The reversal of 28431031 is 13013482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28431031 - 2¹³ = 28422839 is a prime.

It is a super-2 number, since 2×28431031² = 1616647047445922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28430993 and 28431011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28431071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14215515 + 14215516.

It is an arithmetic number, because the mean of its divisors is an integer number (14215516).

Almost surely, 2^28431031 is an apocalyptic number.

28431031 is a deficient number, since it is larger than the sum of its proper divisors (1).

28431031 is an equidigital number, since it uses as much as digits as its factorization.

28431031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 28431031 is about 5332.0756746318. The cubic root of 28431031 is about 305.2091408004.

The spelling of 28431031 in words is "twenty-eight million, four hundred thirty-one thousand, thirty-one".