2117551 has 4 divisors (see below), whose sum is σ = 2190600. Its totient is φ = 2044504.

The previous prime is 2117539. The next prime is 2117561. The reversal of 2117551 is 1557112.

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

It is a cyclic number.

It is not a de Polignac number, because 2117551 - 2⁹ = 2117039 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 (2117501) 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, 36481 + ... + 36538.

It is an arithmetic number, because the mean of its divisors is an integer number (547650).

2^2117551 is an apocalyptic number.

2117551 is a deficient number, since it is larger than the sum of its proper divisors (73049).

2117551 is an equidigital number, since it uses as much as digits as its factorization.

2117551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73048.

The product of its digits is 350, while the sum is 22.

The square root of 2117551 is about 1455.1807447874. The cubic root of 2117551 is about 128.4136803131.

The spelling of 2117551 in words is "two million, one hundred seventeen thousand, five hundred fifty-one".