2166951 has 4 divisors (see below), whose sum is σ = 2889272. Its totient is φ = 1444632.

The previous prime is 2166949. The next prime is 2166953. The reversal of 2166951 is 1596612.

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

It is an interprime number because it is at equal distance from previous prime (2166949) and next prime (2166953).

It is not a de Polignac number, because 2166951 - 2¹ = 2166949 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166953) 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, 361156 + ... + 361161.

It is an arithmetic number, because the mean of its divisors is an integer number (722318).

2^2166951 is an apocalyptic number.

2166951 is a deficient number, since it is larger than the sum of its proper divisors (722321).

2166951 is an equidigital number, since it uses as much as digits as its factorization.

2166951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722320.

The product of its digits is 3240, while the sum is 30.

The square root of 2166951 is about 1472.0567244505. The cubic root of 2166951 is about 129.4045947373.

The spelling of 2166951 in words is "two million, one hundred sixty-six thousand, nine hundred fifty-one".