27973531 has 2 divisors, whose sum is σ = 27973532. Its totient is φ = 27973530.

The previous prime is 27973513. The next prime is 27973549. The reversal of 27973531 is 13537972.

Together with previous prime (27973513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (27973513) and next prime (27973549).

It is a cyclic number.

It is not a de Polignac number, because 27973531 - 2⁵ = 27973499 is a prime.

It is a super-2 number, since 2×27973531² = 1565036873215922, which contains 22 as substring.

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, 13986765 + 13986766.

It is an arithmetic number, because the mean of its divisors is an integer number (13986766).

Almost surely, 2^27973531 is an apocalyptic number.

27973531 is a deficient number, since it is larger than the sum of its proper divisors (1).

27973531 is an equidigital number, since it uses as much as digits as its factorization.

27973531 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 27973531 is about 5289.0009453582. Note that the first 3 decimals coincide. The cubic root of 27973531 is about 303.5631819332.

It can be divided in two parts, 2797 and 3531, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 27973531 in words is "twenty-seven million, nine hundred seventy-three thousand, five hundred thirty-one".