1721364523 has 2 divisors, whose sum is σ = 1721364524. Its totient is φ = 1721364522.

The previous prime is 1721364521. The next prime is 1721364569. The reversal of 1721364523 is 3254631271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1721364523 - 2¹ = 1721364521 is a prime.

Together with 1721364521, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1721364521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860682261 + 860682262.

It is an arithmetic number, because the mean of its divisors is an integer number (860682262).

Almost surely, 2^1721364523 is an apocalyptic number.

1721364523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721364523 is an equidigital number, since it uses as much as digits as its factorization.

1721364523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 34.

The square root of 1721364523 is about 41489.3302307955. The cubic root of 1721364523 is about 1198.4620396942.

Adding to 1721364523 its reverse (3254631271), we get a palindrome (4975995794).

The spelling of 1721364523 in words is "one billion, seven hundred twenty-one million, three hundred sixty-four thousand, five hundred twenty-three".