2115281 has 10 divisors (see below), whose sum is σ = 2470482. Its totient is φ = 1811040.

The previous prime is 2115277. The next prime is 2115301. The reversal of 2115281 is 1825112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1500625 + 614656 = 1225^2 + 784^2 .

It is not a de Polignac number, because 2115281 - 2² = 2115277 is a prime.

It is a super-2 number, since 2×2115281² = 8948827417922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2115221) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1961 + ... + 2841.

2^2115281 is an apocalyptic number.

It is an amenable number.

2115281 is a deficient number, since it is larger than the sum of its proper divisors (355201).

2115281 is an frugal number, since it uses more digits than its factorization.

2115281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909 (or 888 counting only the distinct ones).

The product of its digits is 160, while the sum is 20.

The square root of 2115281 is about 1454.4005638063. The cubic root of 2115281 is about 128.3677777149.

The spelling of 2115281 in words is "two million, one hundred fifteen thousand, two hundred eighty-one".