27993451 has 2 divisors, whose sum is σ = 27993452. Its totient is φ = 27993450.

The previous prime is 27993419. The next prime is 27993481. The reversal of 27993451 is 15439972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27993451 - 2⁵ = 27993419 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27993481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13996725 + 13996726.

It is an arithmetic number, because the mean of its divisors is an integer number (13996726).

Almost surely, 2^27993451 is an apocalyptic number.

27993451 is a deficient number, since it is larger than the sum of its proper divisors (1).

27993451 is an equidigital number, since it uses as much as digits as its factorization.

27993451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 27993451 is about 5290.8837636070. The cubic root of 27993451 is about 303.6352207925.

The spelling of 27993451 in words is "twenty-seven million, nine hundred ninety-three thousand, four hundred fifty-one".