2009951 has 4 divisors (see below), whose sum is σ = 2064312. Its totient is φ = 1955592.

The previous prime is 2009923. The next prime is 2009957. The reversal of 2009951 is 1599002.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2009951 is a prime.

It is a super-3 number, since 3×2009951³ = 24360021359333737053, which contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2009951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009957) 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, 27125 + ... + 27198.

It is an arithmetic number, because the mean of its divisors is an integer number (516078).

2^2009951 is an apocalyptic number.

2009951 is a deficient number, since it is larger than the sum of its proper divisors (54361).

2009951 is an equidigital number, since it uses as much as digits as its factorization.

2009951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54360.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 2009951 is about 1417.7274068029. The cubic root of 2009951 is about 126.2007172937.

The spelling of 2009951 in words is "two million, nine thousand, nine hundred fifty-one".