2649509071 has 4 divisors (see below), whose sum is σ = 2890373544. Its totient is φ = 2408644600.

The previous prime is 2649509053. The next prime is 2649509087. The reversal of 2649509071 is 1709059462.

It is a happy number.

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 2649509071 - 2²¹ = 2647411919 is a prime.

It is a super-3 number, since 3×2649509071³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2649509021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120432220 + ... + 120432241.

It is an arithmetic number, because the mean of its divisors is an integer number (722593386).

Almost surely, 2^2649509071 is an apocalyptic number.

2649509071 is a deficient number, since it is larger than the sum of its proper divisors (240864473).

2649509071 is a wasteful number, since it uses less digits than its factorization.

2649509071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240864472.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 2649509071 is about 51473.3821601029. The cubic root of 2649509071 is about 1383.7420441465.

The spelling of 2649509071 in words is "two billion, six hundred forty-nine million, five hundred nine thousand, seventy-one".