27801121 has 2 divisors, whose sum is σ = 27801122. Its totient is φ = 27801120.

The previous prime is 27801113. The next prime is 27801131. The reversal of 27801121 is 12110872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26666896 + 1134225 = 5164^2 + 1065^2 .

It is a cyclic number.

It is not a de Polignac number, because 27801121 - 2³ = 27801113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27801092 and 27801101.

It is not a weakly prime, because it can be changed into another prime (27801131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13900560 + 13900561.

It is an arithmetic number, because the mean of its divisors is an integer number (13900561).

Almost surely, 2^27801121 is an apocalyptic number.

It is an amenable number.

27801121 is a deficient number, since it is larger than the sum of its proper divisors (1).

27801121 is an equidigital number, since it uses as much as digits as its factorization.

27801121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 27801121 is about 5272.6768343983. The cubic root of 27801121 is about 302.9382432855.

Adding to 27801121 its reverse (12110872), we get a palindrome (39911993).

The spelling of 27801121 in words is "twenty-seven million, eight hundred one thousand, one hundred twenty-one".