720834531 has 4 divisors (see below), whose sum is σ = 961112712. Its totient is φ = 480556352.

The previous prime is 720834523. The next prime is 720834547. The reversal of 720834531 is 135438027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135438027 = 3 ⋅45146009.

It is a cyclic number.

It is not a de Polignac number, because 720834531 - 2³ = 720834523 is a prime.

It is a super-2 number, since 2×720834531² = 1039204842163979922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 720834492 and 720834501.

It is not an unprimeable number, because it can be changed into a prime (720834431) 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 3 ways as a sum of consecutive naturals, for example, 120139086 + ... + 120139091.

It is an arithmetic number, because the mean of its divisors is an integer number (240278178).

Almost surely, 2^720834531 is an apocalyptic number.

720834531 is a deficient number, since it is larger than the sum of its proper divisors (240278181).

720834531 is a wasteful number, since it uses less digits than its factorization.

720834531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240278180.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 720834531 is about 26848.3617935993. The cubic root of 720834531 is about 896.6270999771.

The spelling of 720834531 in words is "seven hundred twenty million, eight hundred thirty-four thousand, five hundred thirty-one".