3811641538 has 4 divisors (see below), whose sum is σ = 5717462310. Its totient is φ = 1905820768.

The previous prime is 3811641527. The next prime is 3811641539. The reversal of 3811641538 is 8351461183.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8351461183 = 13 ⋅642420091.

It can be written as a sum of positive squares in only one way, i.e., 3082803529 + 728838009 = 55523^2 + 26997^2 .

It is a super-2 number, since 2×3811641538² = 29057222428414010888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3811641538.

It is not an unprimeable number, because it can be changed into a prime (3811641539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 952910383 + ... + 952910386.

Almost surely, 2^3811641538 is an apocalyptic number.

3811641538 is a deficient number, since it is larger than the sum of its proper divisors (1905820772).

3811641538 is a wasteful number, since it uses less digits than its factorization.

3811641538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905820771.

The product of its digits is 69120, while the sum is 40.

The square root of 3811641538 is about 61738.4931626939. The cubic root of 3811641538 is about 1562.0826798716.

The spelling of 3811641538 in words is "three billion, eight hundred eleven million, six hundred forty-one thousand, five hundred thirty-eight".