27750551 has 2 divisors, whose sum is σ = 27750552. Its totient is φ = 27750550.

The previous prime is 27750521. The next prime is 27750553. The reversal of 27750551 is 15505772.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27750551 is a prime.

Together with 27750553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27750553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13875275 + 13875276.

It is an arithmetic number, because the mean of its divisors is an integer number (13875276).

Almost surely, 2^27750551 is an apocalyptic number.

27750551 is a deficient number, since it is larger than the sum of its proper divisors (1).

27750551 is an equidigital number, since it uses as much as digits as its factorization.

27750551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12250, while the sum is 32.

The square root of 27750551 is about 5267.8791747723. The cubic root of 27750551 is about 302.7544511153.

The spelling of 27750551 in words is "twenty-seven million, seven hundred fifty thousand, five hundred fifty-one".