720131 has 4 divisors (see below), whose sum is σ = 739632. Its totient is φ = 700632.

The previous prime is 720127. The next prime is 720133. The reversal of 720131 is 131027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131027 = 13 ⋅10079.

It is not a de Polignac number, because 720131 - 2² = 720127 is a prime.

It is a super-2 number, since 2×720131² = 1037177314322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9695 + ... + 9768.

It is an arithmetic number, because the mean of its divisors is an integer number (184908).

2⁷²⁰¹³¹ is an apocalyptic number.

720131 is a deficient number, since it is larger than the sum of its proper divisors (19501).

720131 is a wasteful number, since it uses less digits than its factorization.

720131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19500.

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 720131 is about 848.6053264033. The cubic root of 720131 is about 89.6335303795.

Adding to 720131 its reverse (131027), we get a palindrome (851158).

The spelling of 720131 in words is "seven hundred twenty thousand, one hundred thirty-one".