501491236 has 9 divisors (see below), whose sum is σ = 877688049. Its totient is φ = 250723224.

The previous prime is 501491231. The next prime is 501491251. The reversal of 501491236 is 632194105.

The square root of 501491236 is 22394.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 115132900 + 386358336 = 10730^2 + 19656^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 501491198 and 501491207.

It is not an unprimeable number, because it can be changed into a prime (501491231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 39190 + ... + 50386.

Almost surely, 2^501491236 is an apocalyptic number.

501491236 is the 22394-th square number.

It is an amenable number.

501491236 is a deficient number, since it is larger than the sum of its proper divisors (376196813).

501491236 is an frugal number, since it uses more digits than its factorization.

501491236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22398 (or 11199 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The cubic root of 501491236 is about 794.4888060267.

The spelling of 501491236 in words is "five hundred one million, four hundred ninety-one thousand, two hundred thirty-six".