2721261826 has 4 divisors (see below), whose sum is σ = 4081892742. Its totient is φ = 1360630912.

The previous prime is 2721261817. The next prime is 2721261847. The reversal of 2721261826 is 6281621272.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 2445203601 + 276058225 = 49449^2 + 16615^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680315455 + ... + 680315458.

Almost surely, 2^2721261826 is an apocalyptic number.

2721261826 is a deficient number, since it is larger than the sum of its proper divisors (1360630916).

2721261826 is a wasteful number, since it uses less digits than its factorization.

2721261826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360630915.

The product of its digits is 32256, while the sum is 37.

The square root of 2721261826 is about 52165.7150435034. The cubic root of 2721261826 is about 1396.1222327516.

The spelling of 2721261826 in words is "two billion, seven hundred twenty-one million, two hundred sixty-one thousand, eight hundred twenty-six".