28831631 has 2 divisors, whose sum is σ = 28831632. Its totient is φ = 28831630.

The previous prime is 28831613. The next prime is 28831669. The reversal of 28831631 is 13613882.

It is a happy number.

Together with previous prime (28831613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28831631 - 2¹⁴ = 28815247 is a prime.

It is a super-2 number, since 2×28831631² = 1662525892240322, 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 (28831681) 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, 14415815 + 14415816.

It is an arithmetic number, because the mean of its divisors is an integer number (14415816).

Almost surely, 2^28831631 is an apocalyptic number.

28831631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28831631 is an equidigital number, since it uses as much as digits as its factorization.

28831631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 28831631 is about 5369.5093816847. The cubic root of 28831631 is about 306.6359501108.

The spelling of 28831631 in words is "twenty-eight million, eight hundred thirty-one thousand, six hundred thirty-one".