721325423431 has 2 divisors, whose sum is σ = 721325423432. Its totient is φ = 721325423430.

The previous prime is 721325423419. The next prime is 721325423447. The reversal of 721325423431 is 134324523127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721325423431 - 2⁹ = 721325422919 is a prime.

It is a super-2 number, since 2×721325423431² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721325424431) 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, 360662711715 + 360662711716.

It is an arithmetic number, because the mean of its divisors is an integer number (360662711716).

Almost surely, 2^721325423431 is an apocalyptic number.

721325423431 is a deficient number, since it is larger than the sum of its proper divisors (1).

721325423431 is an equidigital number, since it uses as much as digits as its factorization.

721325423431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 37.

Adding to 721325423431 its reverse (134324523127), we get a palindrome (855649946558).

The spelling of 721325423431 in words is "seven hundred twenty-one billion, three hundred twenty-five million, four hundred twenty-three thousand, four hundred thirty-one".