2918281 has 4 divisors (see below), whose sum is σ = 2986192. Its totient is φ = 2850372.

The previous prime is 2918273. The next prime is 2918291. The reversal of 2918281 is 1828192.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 2918281 - 2³ = 2918273 is a prime.

It is a super-2 number, since 2×2918281² = 17032727989922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2918231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33891 + ... + 33976.

It is an arithmetic number, because the mean of its divisors is an integer number (746548).

2^2918281 is an apocalyptic number.

It is an amenable number.

2918281 is a deficient number, since it is larger than the sum of its proper divisors (67911).

2918281 is an equidigital number, since it uses as much as digits as its factorization.

2918281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67910.

The product of its digits is 2304, while the sum is 31.

The square root of 2918281 is about 1708.2976906851. The cubic root of 2918281 is about 142.9033366328.

The spelling of 2918281 in words is "two million, nine hundred eighteen thousand, two hundred eighty-one".