491071949 has 4 divisors (see below), whose sum is σ = 497799036. Its totient is φ = 484344864.

The previous prime is 491071943. The next prime is 491071969. The reversal of 491071949 is 949170194.

It is a happy number.

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 423124900 + 67947049 = 20570^2 + 8243^2 .

It is a cyclic number.

It is not a de Polignac number, because 491071949 - 2¹² = 491067853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491071943) 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, 3363434 + ... + 3363579.

It is an arithmetic number, because the mean of its divisors is an integer number (124449759).

Almost surely, 2^491071949 is an apocalyptic number.

It is an amenable number.

491071949 is a deficient number, since it is larger than the sum of its proper divisors (6727087).

491071949 is an equidigital number, since it uses as much as digits as its factorization.

491071949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6727086.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 491071949 is about 22160.1432531471. The cubic root of 491071949 is about 788.9479929716.

The spelling of 491071949 in words is "four hundred ninety-one million, seventy-one thousand, nine hundred forty-nine".