3981037091 has 4 divisors (see below), whose sum is σ = 3982152384. Its totient is φ = 3979921800.

The previous prime is 3981037069. The next prime is 3981037097. The reversal of 3981037091 is 1907301893.

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 3981037091 - 2¹⁰ = 3981036067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981037097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552275 + ... + 559436.

It is an arithmetic number, because the mean of its divisors is an integer number (995538096).

Almost surely, 2^3981037091 is an apocalyptic number.

3981037091 is a deficient number, since it is larger than the sum of its proper divisors (1115293).

3981037091 is a wasteful number, since it uses less digits than its factorization.

3981037091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115292.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 3981037091 is about 63095.4601457189. The cubic root of 3981037091 is about 1584.8885990163. Note that the first 3 decimals are identical.

The spelling of 3981037091 in words is "three billion, nine hundred eighty-one million, thirty-seven thousand, ninety-one".