2277981 has 6 divisors (see below), whose sum is σ = 3290430. Its totient is φ = 1518648.

The previous prime is 2277941. The next prime is 2278007. The reversal of 2277981 is 1897722.

It can be written as a sum of positive squares in only one way, i.e., 2277081 + 900 = 1509^2 + 30^2 .

It is not a de Polignac number, because 2277981 - 2⁶ = 2277917 is a prime.

It is a super-2 number, since 2×2277981² = 10378394872722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2277901) 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, 126546 + ... + 126563.

It is an arithmetic number, because the mean of its divisors is an integer number (548405).

2^2277981 is an apocalyptic number.

It is an amenable number.

2277981 is a deficient number, since it is larger than the sum of its proper divisors (1012449).

2277981 is a wasteful number, since it uses less digits than its factorization.

2277981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253115 (or 253112 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 2277981 is about 1509.2981812750. The cubic root of 2277981 is about 131.5780257592.

The spelling of 2277981 in words is "two million, two hundred seventy-seven thousand, nine hundred eighty-one".