720431551 has 8 divisors (see below), whose sum is σ = 845603360. Its totient is φ = 600823008.

The previous prime is 720431527. The next prime is 720431567. The reversal of 720431551 is 155134027.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 720431551 - 2⁵ = 720431519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720431521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1390536 + ... + 1391053.

It is an arithmetic number, because the mean of its divisors is an integer number (105700420).

Almost surely, 2^720431551 is an apocalyptic number.

720431551 is a deficient number, since it is larger than the sum of its proper divisors (125171809).

720431551 is a wasteful number, since it uses less digits than its factorization.

720431551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781633.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 720431551 is about 26840.8560034884. The cubic root of 720431551 is about 896.4599834262.

Adding to 720431551 its reverse (155134027), we get a palindrome (875565578).

The spelling of 720431551 in words is "seven hundred twenty million, four hundred thirty-one thousand, five hundred fifty-one".