3721109281 has 4 divisors (see below), whose sum is σ = 3744810772. Its totient is φ = 3697407792.

The previous prime is 3721109263. The next prime is 3721109297. The reversal of 3721109281 is 1829011273.

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

It can be written as a sum of positive squares in 2 ways, for example, as 643078881 + 3078030400 = 25359^2 + 55480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3721109281 is a prime.

It is a super-2 number, since 2×3721109281² = 27693308562288673922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3721109261) 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, 11850510 + ... + 11850823.

It is an arithmetic number, because the mean of its divisors is an integer number (936202693).

Almost surely, 2^3721109281 is an apocalyptic number.

It is an amenable number.

3721109281 is a deficient number, since it is larger than the sum of its proper divisors (23701491).

3721109281 is a wasteful number, since it uses less digits than its factorization.

3721109281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23701490.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 3721109281 is about 61000.8957393250. The cubic root of 3721109281 is about 1549.6161770403.

The spelling of 3721109281 in words is "three billion, seven hundred twenty-one million, one hundred nine thousand, two hundred eighty-one".