3656421247 has 2 divisors, whose sum is σ = 3656421248. Its totient is φ = 3656421246.

The previous prime is 3656421221. The next prime is 3656421253. The reversal of 3656421247 is 7421246563.

It is a strong prime.

It is an emirp because it is prime and its reverse (7421246563) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3656421247 - 2²³ = 3648032639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3656421257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1828210623 + 1828210624.

It is an arithmetic number, because the mean of its divisors is an integer number (1828210624).

Almost surely, 2^3656421247 is an apocalyptic number.

3656421247 is a deficient number, since it is larger than the sum of its proper divisors (1).

3656421247 is an equidigital number, since it uses as much as digits as its factorization.

3656421247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 40.

The square root of 3656421247 is about 60468.3491340718. The cubic root of 3656421247 is about 1540.5840881889.

The spelling of 3656421247 in words is "three billion, six hundred fifty-six million, four hundred twenty-one thousand, two hundred forty-seven".