2991969 has 6 divisors (see below), whose sum is σ = 4321746. Its totient is φ = 1994640.

The previous prime is 2991929. The next prime is 2991971. The reversal of 2991969 is 9691992.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2934369 + 57600 = 1713^2 + 240^2 .

It is not a de Polignac number, because 2991969 - 2¹³ = 2983777 is a prime.

It is a super-2 number, since 2×2991969² = 17903756993922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2991929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 166212 + ... + 166229.

It is an arithmetic number, because the mean of its divisors is an integer number (720291).

2^2991969 is an apocalyptic number.

It is an amenable number.

2991969 is a deficient number, since it is larger than the sum of its proper divisors (1329777).

2991969 is a wasteful number, since it uses less digits than its factorization.

2991969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332447 (or 332444 counting only the distinct ones).

The product of its digits is 78732, while the sum is 45.

The square root of 2991969 is about 1729.7309039270. The cubic root of 2991969 is about 144.0961452826.

The spelling of 2991969 in words is "two million, nine hundred ninety-one thousand, nine hundred sixty-nine".