2099951 has 4 divisors (see below), whose sum is σ = 2399952. Its totient is φ = 1799952.

The previous prime is 2099941. The next prime is 2099963. The reversal of 2099951 is 1599902.

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

It is not a de Polignac number, because 2099951 - 2⁶ = 2099887 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 (2099921) 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, 149990 + ... + 150003.

It is an arithmetic number, because the mean of its divisors is an integer number (599988).

2^2099951 is an apocalyptic number.

2099951 is a deficient number, since it is larger than the sum of its proper divisors (300001).

2099951 is an equidigital number, since it uses as much as digits as its factorization.

2099951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300000.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 2099951 is about 1449.1207679141. The cubic root of 2099951 is about 128.0569204850.

The spelling of 2099951 in words is "two million, ninety-nine thousand, nine hundred fifty-one".