2099551 has 4 divisors (see below), whose sum is σ = 2223072. Its totient is φ = 1976032.

The previous prime is 2099549. The next prime is 2099593. The reversal of 2099551 is 1559902.

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 2099551 - 2¹ = 2099549 is a prime.

It is a super-2 number, since 2×2099551² = 8816228803202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2099521) 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, 61735 + ... + 61768.

It is an arithmetic number, because the mean of its divisors is an integer number (555768).

2^2099551 is an apocalyptic number.

2099551 is a deficient number, since it is larger than the sum of its proper divisors (123521).

2099551 is a wasteful number, since it uses less digits than its factorization.

2099551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123520.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 2099551 is about 1448.9827466192. The cubic root of 2099551 is about 128.0487891808.

The spelling of 2099551 in words is "two million, ninety-nine thousand, five hundred fifty-one".