28311553 has 2 divisors, whose sum is σ = 28311554. Its totient is φ = 28311552.

The previous prime is 28311541. The next prime is 28311557. The reversal of 28311553 is 35511382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24671089 + 3640464 = 4967^2 + 1908^2 .

It is a cyclic number.

It is not a de Polignac number, because 28311553 - 2¹³ = 28303361 is a prime.

It is not a weakly prime, because it can be changed into another prime (28311557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a Pierpont prime, being equal to 2²⁰ ⋅ 3³ + 1.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14155776 + 14155777.

It is an arithmetic number, because the mean of its divisors is an integer number (14155777).

It is a Proth number, since it is equal to 27 ⋅ 2²⁰ + 1 and 27 < 2²⁰.

Almost surely, 2^28311553 is an apocalyptic number.

It is an amenable number.

28311553 is a deficient number, since it is larger than the sum of its proper divisors (1).

28311553 is an equidigital number, since it uses as much as digits as its factorization.

28311553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 28311553 is about 5320.8601748214. The cubic root of 28311553 is about 304.7810055663.

The spelling of 28311553 in words is "twenty-eight million, three hundred eleven thousand, five hundred fifty-three".