491939949 has 4 divisors (see below), whose sum is σ = 655919936. Its totient is φ = 327959964.

The previous prime is 491939941. The next prime is 491939951. The reversal of 491939949 is 949939194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 491939949 - 2³ = 491939941 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 (491939941) 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, 81989989 + ... + 81989994.

It is an arithmetic number, because the mean of its divisors is an integer number (163979984).

Almost surely, 2^491939949 is an apocalyptic number.

It is an amenable number.

491939949 is a deficient number, since it is larger than the sum of its proper divisors (163979987).

491939949 is a wasteful number, since it uses less digits than its factorization.

491939949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163979986.

The product of its digits is 2834352, while the sum is 57.

The square root of 491939949 is about 22179.7193174305. The cubic root of 491939949 is about 789.4125574654.

The spelling of 491939949 in words is "four hundred ninety-one million, nine hundred thirty-nine thousand, nine hundred forty-nine".