3815971513 has 2 divisors, whose sum is σ = 3815971514. Its totient is φ = 3815971512.

The previous prime is 3815971493. The next prime is 3815971519. The reversal of 3815971513 is 3151795183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3272755264 + 543216249 = 57208^2 + 23307^2 .

It is a cyclic number.

It is not a de Polignac number, because 3815971513 - 2²⁵ = 3782417081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3815971513.

It is not a weakly prime, because it can be changed into another prime (3815971519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1907985756 + 1907985757.

It is an arithmetic number, because the mean of its divisors is an integer number (1907985757).

Almost surely, 2^3815971513 is an apocalyptic number.

It is an amenable number.

3815971513 is a deficient number, since it is larger than the sum of its proper divisors (1).

3815971513 is an equidigital number, since it uses as much as digits as its factorization.

3815971513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 43.

The square root of 3815971513 is about 61773.5502703220. The cubic root of 3815971513 is about 1562.6739578736.

The spelling of 3815971513 in words is "three billion, eight hundred fifteen million, nine hundred seventy-one thousand, five hundred thirteen".