27145861 has 4 divisors (see below), whose sum is σ = 27234592. Its totient is φ = 27057132.

The previous prime is 27145849. The next prime is 27145873. The reversal of 27145861 is 16854172.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (27145849) and next prime (27145873).

It is a cyclic number.

It is not a de Polignac number, because 27145861 - 2⁵ = 27145829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27145961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43905 + ... + 44518.

It is an arithmetic number, because the mean of its divisors is an integer number (6808648).

Almost surely, 2^27145861 is an apocalyptic number.

It is an amenable number.

27145861 is a deficient number, since it is larger than the sum of its proper divisors (88731).

27145861 is an equidigital number, since it uses as much as digits as its factorization.

27145861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88730.

The product of its digits is 13440, while the sum is 34.

The square root of 27145861 is about 5210.1689991784. The cubic root of 27145861 is about 300.5392560216.

The spelling of 27145861 in words is "twenty-seven million, one hundred forty-five thousand, eight hundred sixty-one".