731020505 has 4 divisors (see below), whose sum is σ = 877224612. Its totient is φ = 584816400.

The previous prime is 731020471. The next prime is 731020513. The reversal of 731020505 is 505020137.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 378069136 + 352951369 = 19444^2 + 18787^2 .

It is not a de Polignac number, because 731020505 - 2⁸ = 731020249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 73102046 + ... + 73102055.

It is an arithmetic number, because the mean of its divisors is an integer number (219306153).

Almost surely, 2^731020505 is an apocalyptic number.

It is an amenable number.

731020505 is a deficient number, since it is larger than the sum of its proper divisors (146204107).

731020505 is a wasteful number, since it uses less digits than its factorization.

731020505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146204106.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 731020505 is about 27037.3908689430. The cubic root of 731020505 is about 900.8307165366.

The spelling of 731020505 in words is "seven hundred thirty-one million, twenty thousand, five hundred five".