3651872689 has 4 divisors (see below), whose sum is σ = 3651995124. Its totient is φ = 3651750256.

The previous prime is 3651872659. The next prime is 3651872711. The reversal of 3651872689 is 9862781563.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9862781563 = 1433 ⋅6882611.

It can be written as a sum of positive squares in 2 ways, for example, as 1878789025 + 1773083664 = 43345^2 + 42108^2 .

It is a cyclic number.

It is not a de Polignac number, because 3651872689 - 2¹¹ = 3651870641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3651872639) 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, 15939 + ... + 86935.

It is an arithmetic number, because the mean of its divisors is an integer number (912998781).

Almost surely, 2^3651872689 is an apocalyptic number.

It is an amenable number.

3651872689 is a deficient number, since it is larger than the sum of its proper divisors (122435).

3651872689 is an equidigital number, since it uses as much as digits as its factorization.

3651872689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122434.

The product of its digits is 4354560, while the sum is 55.

The square root of 3651872689 is about 60430.7263649875. The cubic root of 3651872689 is about 1539.9449984573.

The spelling of 3651872689 in words is "three billion, six hundred fifty-one million, eight hundred seventy-two thousand, six hundred eighty-nine".