3981481157 has 8 divisors (see below), whose sum is σ = 4004985600. Its totient is φ = 3958012080.

The previous prime is 3981481151. The next prime is 3981481181. The reversal of 3981481157 is 7511841893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3981481157 - 2⁶ = 3981481093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981481151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236843 + ... + 253095.

It is an arithmetic number, because the mean of its divisors is an integer number (500623200).

Almost surely, 2^3981481157 is an apocalyptic number.

It is an amenable number.

3981481157 is a deficient number, since it is larger than the sum of its proper divisors (23504443).

3981481157 is a wasteful number, since it uses less digits than its factorization.

3981481157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17683.

The product of its digits is 241920, while the sum is 47.

The square root of 3981481157 is about 63098.9790487929. The cubic root of 3981481157 is about 1584.9475257865.

The spelling of 3981481157 in words is "three billion, nine hundred eighty-one million, four hundred eighty-one thousand, one hundred fifty-seven".