3628121791 has 4 divisors (see below), whose sum is σ = 4146424912. Its totient is φ = 3109818672.

The previous prime is 3628121771. The next prime is 3628121803. The reversal of 3628121791 is 1971218263.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1971218263 = 7 ⋅281602609.

It is a cyclic number.

It is not a de Polignac number, because 3628121791 - 2¹⁹ = 3627597503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3628121701) 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, 259151550 + ... + 259151563.

It is an arithmetic number, because the mean of its divisors is an integer number (1036606228).

Almost surely, 2^3628121791 is an apocalyptic number.

3628121791 is a deficient number, since it is larger than the sum of its proper divisors (518303121).

3628121791 is an equidigital number, since it uses as much as digits as its factorization.

3628121791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518303120.

The product of its digits is 36288, while the sum is 40.

The square root of 3628121791 is about 60233.8923779628. The cubic root of 3628121791 is about 1536.5992578586.

The spelling of 3628121791 in words is "three billion, six hundred twenty-eight million, one hundred twenty-one thousand, seven hundred ninety-one".