2717981 has 6 divisors (see below), whose sum is σ = 3161790. Its totient is φ = 2329656.

The previous prime is 2717929. The next prime is 2717993. The reversal of 2717981 is 1897172.

It can be written as a sum of positive squares in only one way, i.e., 1416100 + 1301881 = 1190^2 + 1141^2 .

It is not a de Polignac number, because 2717981 - 2¹⁴ = 2701597 is a prime.

It is a super-2 number, since 2×2717981² = 14774841432722, 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 (2717921) 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, 27686 + ... + 27783.

It is an arithmetic number, because the mean of its divisors is an integer number (526965).

2^2717981 is an apocalyptic number.

It is an amenable number.

2717981 is a deficient number, since it is larger than the sum of its proper divisors (443809).

2717981 is an equidigital number, since it uses as much as digits as its factorization.

2717981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55483 (or 55476 counting only the distinct ones).

The product of its digits is 7056, while the sum is 35.

The square root of 2717981 is about 1648.6300373340. The cubic root of 2717981 is about 139.5560939693.

Subtracting from 2717981 its sum of digits (35), we obtain a triangular number (2717946 = T₂₃₃₁).

The spelling of 2717981 in words is "two million, seven hundred seventeen thousand, nine hundred eighty-one".