27031861 has 2 divisors, whose sum is σ = 27031862. Its totient is φ = 27031860.

The previous prime is 27031801. The next prime is 27031883. The reversal of 27031861 is 16813072.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24690961 + 2340900 = 4969^2 + 1530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27031861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27031801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13515930 + 13515931.

It is an arithmetic number, because the mean of its divisors is an integer number (13515931).

Almost surely, 2^27031861 is an apocalyptic number.

It is an amenable number.

27031861 is a deficient number, since it is larger than the sum of its proper divisors (1).

27031861 is an equidigital number, since it uses as much as digits as its factorization.

27031861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 27031861 is about 5199.2173449472. The cubic root of 27031861 is about 300.1179573179.

It can be divided in two parts, 270 and 31861, that added together give a triangular number (32131 = T₂₅₃).

The spelling of 27031861 in words is "twenty-seven million, thirty-one thousand, eight hundred sixty-one".