721252148417 has 2 divisors, whose sum is σ = 721252148418. Its totient is φ = 721252148416.

The previous prime is 721252148389. The next prime is 721252148501. The reversal of 721252148417 is 714841252127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514255357456 + 206996790961 = 717116^2 + 454969^2 .

It is an emirp because it is prime and its reverse (714841252127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721252148417 - 2³⁴ = 704072279233 is a prime.

It is a super-2 number, since 2×721252148417² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (721252148317) 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 as a sum of consecutive naturals, namely, 360626074208 + 360626074209.

It is an arithmetic number, because the mean of its divisors is an integer number (360626074209).

Almost surely, 2^721252148417 is an apocalyptic number.

It is an amenable number.

721252148417 is a deficient number, since it is larger than the sum of its proper divisors (1).

721252148417 is an equidigital number, since it uses as much as digits as its factorization.

721252148417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 250880, while the sum is 44.

The spelling of 721252148417 in words is "seven hundred twenty-one billion, two hundred fifty-two million, one hundred forty-eight thousand, four hundred seventeen".