721454423 has 2 divisors, whose sum is σ = 721454424. Its totient is φ = 721454422.

The previous prime is 721454411. The next prime is 721454429. The reversal of 721454423 is 324454127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721454423 - 2¹⁰ = 721453399 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721454423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721454429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360727211 + 360727212.

It is an arithmetic number, because the mean of its divisors is an integer number (360727212).

Almost surely, 2^721454423 is an apocalyptic number.

721454423 is a deficient number, since it is larger than the sum of its proper divisors (1).

721454423 is an equidigital number, since it uses as much as digits as its factorization.

721454423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 32.

The square root of 721454423 is about 26859.9036297601. The cubic root of 721454423 is about 896.8840487831.

The spelling of 721454423 in words is "seven hundred twenty-one million, four hundred fifty-four thousand, four hundred twenty-three".