720251951 has 4 divisors (see below), whose sum is σ = 720380304. Its totient is φ = 720123600.

The previous prime is 720251947. The next prime is 720251957. The reversal of 720251951 is 159152027.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 159152027 = 349 ⋅456023.

It is a cyclic number.

It is not a de Polignac number, because 720251951 - 2² = 720251947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720251957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55355 + ... + 67116.

It is an arithmetic number, because the mean of its divisors is an integer number (180095076).

Almost surely, 2^720251951 is an apocalyptic number.

720251951 is a deficient number, since it is larger than the sum of its proper divisors (128353).

720251951 is a wasteful number, since it uses less digits than its factorization.

720251951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128352.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 720251951 is about 26837.5101490433. The cubic root of 720251951 is about 896.3854828976.

The spelling of 720251951 in words is "seven hundred twenty million, two hundred fifty-one thousand, nine hundred fifty-one".