3218406361 has 3 divisors (see below), whose sum is σ = 3218463093. Its totient is φ = 3218349630.

The previous prime is 3218406343. The next prime is 3218406383. The reversal of 3218406361 is 1636048123.

It is a happy number.

The square root of 3218406361 is 56731.

It is a perfect power (a square), and thus also a powerful number.

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: 1636048123 = 13411 ⋅121993.

It is not a de Polignac number, because 3218406361 - 2⁹ = 3218405849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3218406311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 28366 + ... + 85096.

It is an arithmetic number, because the mean of its divisors is an integer number (1072821031).

Almost surely, 2^3218406361 is an apocalyptic number.

3218406361 is the 56731-st square number.

3218406361 is the 28366-th centered octagonal number.

It is an amenable number.

3218406361 is a deficient number, since it is larger than the sum of its proper divisors (56732).

3218406361 is an frugal number, since it uses more digits than its factorization.

3218406361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113462 (or 56731 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The cubic root of 3218406361 is about 1476.4326000486.

Multiplying 3218406361 by its product of nonzero digits (20736), we get a square (66736874301696 = 8169264²).

The spelling of 3218406361 in words is "three billion, two hundred eighteen million, four hundred six thousand, three hundred sixty-one".