27973513 has 2 divisors, whose sum is σ = 27973514. Its totient is φ = 27973512.

The previous prime is 27973511. The next prime is 27973531. The reversal of 27973513 is 31537972.

Together with next prime (27973531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23941449 + 4032064 = 4893^2 + 2008^2 .

It is a cyclic number.

It is not a de Polignac number, because 27973513 - 2¹ = 27973511 is a prime.

It is a super-2 number, since 2×27973513² = 1565034859122338, which contains 22 as substring.

Together with 27973511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (27973511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13986756 + 13986757.

It is an arithmetic number, because the mean of its divisors is an integer number (13986757).

Almost surely, 2^27973513 is an apocalyptic number.

It is an amenable number.

27973513 is a deficient number, since it is larger than the sum of its proper divisors (1).

27973513 is an equidigital number, since it uses as much as digits as its factorization.

27973513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39690, while the sum is 37.

The square root of 27973513 is about 5288.9992437133. Note that the first 3 decimals coincide. The cubic root of 27973513 is about 303.5631168224.

The spelling of 27973513 in words is "twenty-seven million, nine hundred seventy-three thousand, five hundred thirteen".