27100981 has 2 divisors, whose sum is σ = 27100982. Its totient is φ = 27100980.

The previous prime is 27100963. The next prime is 27101017. The reversal of 27100981 is 18900172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26780625 + 320356 = 5175^2 + 566^2 .

It is a cyclic number.

It is not a de Polignac number, because 27100981 - 2¹¹ = 27098933 is a prime.

It is a super-2 number, since 2×27100981² = 1468926342324722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27100921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13550490 + 13550491.

It is an arithmetic number, because the mean of its divisors is an integer number (13550491).

Almost surely, 2^27100981 is an apocalyptic number.

It is an amenable number.

27100981 is a deficient number, since it is larger than the sum of its proper divisors (1).

27100981 is an equidigital number, since it uses as much as digits as its factorization.

27100981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 27100981 is about 5205.8602555197. The cubic root of 27100981 is about 300.3735384075.

The spelling of 27100981 in words is "twenty-seven million, one hundred thousand, nine hundred eighty-one".