491762309 has 4 divisors (see below), whose sum is σ = 508719660. Its totient is φ = 474804960.

The previous prime is 491762303. The next prime is 491762317. The reversal of 491762309 is 903267194.

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 253924225 + 237838084 = 15935^2 + 15422^2 .

It is a cyclic number.

It is not a de Polignac number, because 491762309 - 2¹² = 491758213 is a prime.

It is a super-2 number, since 2×491762309² = 483660337106022962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491762303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8478632 + ... + 8478689.

It is an arithmetic number, because the mean of its divisors is an integer number (127179915).

Almost surely, 2^491762309 is an apocalyptic number.

It is an amenable number.

491762309 is a deficient number, since it is larger than the sum of its proper divisors (16957351).

491762309 is a wasteful number, since it uses less digits than its factorization.

491762309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16957350.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 491762309 is about 22175.7143966096. The cubic root of 491762309 is about 789.3175268086.

The spelling of 491762309 in words is "four hundred ninety-one million, seven hundred sixty-two thousand, three hundred nine".