3656100521 has 4 divisors (see below), whose sum is σ = 3656620500. Its totient is φ = 3655580544.

The previous prime is 3656100473. The next prime is 3656100541. The reversal of 3656100521 is 1250016563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1250016563 = 4159 ⋅300557.

It can be written as a sum of positive squares in 2 ways, for example, as 1466890000 + 2189210521 = 38300^2 + 46789^2 .

It is a cyclic number.

It is not a de Polignac number, because 3656100521 - 2¹⁴ = 3656084137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3656100541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249296 + ... + 263553.

It is an arithmetic number, because the mean of its divisors is an integer number (914155125).

Almost surely, 2^3656100521 is an apocalyptic number.

It is an amenable number.

3656100521 is a deficient number, since it is larger than the sum of its proper divisors (519979).

3656100521 is an equidigital number, since it uses as much as digits as its factorization.

3656100521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519978.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 3656100521 is about 60465.6970603995. The cubic root of 3656100521 is about 1540.5390423379.

The spelling of 3656100521 in words is "three billion, six hundred fifty-six million, one hundred thousand, five hundred twenty-one".