27791501 has 2 divisors, whose sum is σ = 27791502. Its totient is φ = 27791500.

The previous prime is 27791497. The next prime is 27791503. The reversal of 27791501 is 10519772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17222500 + 10569001 = 4150^2 + 3251^2 .

It is a cyclic number.

It is not a de Polignac number, because 27791501 - 2² = 27791497 is a prime.

Together with 27791503, 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 (27791503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13895750 + 13895751.

It is an arithmetic number, because the mean of its divisors is an integer number (13895751).

Almost surely, 2^27791501 is an apocalyptic number.

It is an amenable number.

27791501 is a deficient number, since it is larger than the sum of its proper divisors (1).

27791501 is an equidigital number, since it uses as much as digits as its factorization.

27791501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 27791501 is about 5271.7645053625. The cubic root of 27791501 is about 302.9032974272.

The spelling of 27791501 in words is "twenty-seven million, seven hundred ninety-one thousand, five hundred one".