2137281 has 4 divisors (see below), whose sum is σ = 2849712. Its totient is φ = 1424852.

The previous prime is 2137279. The next prime is 2137301. The reversal of 2137281 is 1827312.

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 2137281 - 2¹ = 2137279 is a prime.

It is a super-2 number, since 2×2137281² = 9135940145922, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2137211) 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, 356211 + ... + 356216.

It is an arithmetic number, because the mean of its divisors is an integer number (712428).

2^2137281 is an apocalyptic number.

It is an amenable number.

2137281 is a deficient number, since it is larger than the sum of its proper divisors (712431).

2137281 is an equidigital number, since it uses as much as digits as its factorization.

2137281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712430.

The product of its digits is 672, while the sum is 24.

The square root of 2137281 is about 1461.9442533831. The cubic root of 2137281 is about 128.8112738161.

The spelling of 2137281 in words is "two million, one hundred thirty-seven thousand, two hundred eighty-one".