2116551 has 16 divisors (see below), whose sum is σ = 3055104. Its totient is φ = 1298304.

The previous prime is 2116537. The next prime is 2116559. The reversal of 2116551 is 1556112.

It is not a de Polignac number, because 2116551 - 2⁵ = 2116519 is a prime.

2116551 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1956 + ... + 2838.

It is an arithmetic number, because the mean of its divisors is an integer number (190944).

2^2116551 is an apocalyptic number.

2116551 is a deficient number, since it is larger than the sum of its proper divisors (938553).

2116551 is a wasteful number, since it uses less digits than its factorization.

2116551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950.

The product of its digits is 300, while the sum is 21.

The square root of 2116551 is about 1454.8371042835. The cubic root of 2116551 is about 128.3934629488.

The spelling of 2116551 in words is "two million, one hundred sixteen thousand, five hundred fifty-one".