3651552121 has 4 divisors (see below), whose sum is σ = 4173202432. Its totient is φ = 3129901812.

The previous prime is 3651552103. The next prime is 3651552137. The reversal of 3651552121 is 1212551563.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3651552121 - 2¹⁷ = 3651421049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3651552181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260825145 + ... + 260825158.

It is an arithmetic number, because the mean of its divisors is an integer number (1043300608).

Almost surely, 2^3651552121 is an apocalyptic number.

It is an amenable number.

3651552121 is a deficient number, since it is larger than the sum of its proper divisors (521650311).

3651552121 is an equidigital number, since it uses as much as digits as its factorization.

3651552121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521650310.

The product of its digits is 9000, while the sum is 31.

The square root of 3651552121 is about 60428.0739474625. The cubic root of 3651552121 is about 1539.8999374182.

The spelling of 3651552121 in words is "three billion, six hundred fifty-one million, five hundred fifty-two thousand, one hundred twenty-one".