27122981 has 6 divisors (see below), whose sum is σ = 27770310. Its totient is φ = 26490408.

The previous prime is 27122969. The next prime is 27122983. The reversal of 27122981 is 18922172.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 24453025 + 2669956 = 4945^2 + 1634^2 .

It is not a de Polignac number, because 27122981 - 2¹⁰ = 27121957 is a prime.

It is a super-2 number, since 2×27122981² = 1471312196652722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27122983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5486 + ... + 9183.

It is an arithmetic number, because the mean of its divisors is an integer number (4628385).

Almost surely, 2^27122981 is an apocalyptic number.

It is an amenable number.

27122981 is a deficient number, since it is larger than the sum of its proper divisors (647329).

27122981 is an equidigital number, since it uses as much as digits as its factorization.

27122981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14755 (or 14712 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 27122981 is about 5207.9728301903. The cubic root of 27122981 is about 300.4547953740.

The spelling of 27122981 in words is "twenty-seven million, one hundred twenty-two thousand, nine hundred eighty-one".