8641381157 has 4 divisors (see below), whose sum is σ = 8641713900. Its totient is φ = 8641048416.

The previous prime is 8641381153. The next prime is 8641381159. The reversal of 8641381157 is 7511831468.

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 8434769281 + 206611876 = 91841^2 + 14374^2 .

It is a cyclic number.

It is not a de Polignac number, because 8641381157 - 2² = 8641381153 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 (8641381153) 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, 123782 + ... + 180567.

It is an arithmetic number, because the mean of its divisors is an integer number (2160428475).

Almost surely, 2^8641381157 is an apocalyptic number.

It is an amenable number.

8641381157 is a deficient number, since it is larger than the sum of its proper divisors (332743).

8641381157 is a wasteful number, since it uses less digits than its factorization.

8641381157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332742.

The product of its digits is 161280, while the sum is 44.

The square root of 8641381157 is about 92959.0294538406. The cubic root of 8641381157 is about 2052.0804702441.

The spelling of 8641381157 in words is "eight billion, six hundred forty-one million, three hundred eighty-one thousand, one hundred fifty-seven".