3981126157 has 4 divisors (see below), whose sum is σ = 3988767996. Its totient is φ = 3973484320.

The previous prime is 3981126151. The next prime is 3981126161. The reversal of 3981126157 is 7516211893.

3981126157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 962612676 + 3018513481 = 31026^2 + 54941^2 .

It is a cyclic number.

It is not a de Polignac number, because 3981126157 - 2¹⁹ = 3980601869 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 (3981126151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3820138 + ... + 3821179.

It is an arithmetic number, because the mean of its divisors is an integer number (997191999).

Almost surely, 2^3981126157 is an apocalyptic number.

It is an amenable number.

3981126157 is a deficient number, since it is larger than the sum of its proper divisors (7641839).

3981126157 is an equidigital number, since it uses as much as digits as its factorization.

3981126157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7641838.

The product of its digits is 90720, while the sum is 43.

The square root of 3981126157 is about 63096.1659453251. The cubic root of 3981126157 is about 1584.9004182677.

The spelling of 3981126157 in words is "three billion, nine hundred eighty-one million, one hundred twenty-six thousand, one hundred fifty-seven".