2217551 has 4 divisors (see below), whose sum is σ = 2534352. Its totient is φ = 1900752.

The previous prime is 2217541. The next prime is 2217557. The reversal of 2217551 is 1557122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2217551 - 2¹⁸ = 1955407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2217557) 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, 158390 + ... + 158403.

It is an arithmetic number, because the mean of its divisors is an integer number (633588).

2^2217551 is an apocalyptic number.

2217551 is a deficient number, since it is larger than the sum of its proper divisors (316801).

2217551 is an equidigital number, since it uses as much as digits as its factorization.

2217551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316800.

The product of its digits is 700, while the sum is 23.

The square root of 2217551 is about 1489.1443852092. The cubic root of 2217551 is about 130.4040878127.

The spelling of 2217551 in words is "two million, two hundred seventeen thousand, five hundred fifty-one".