491771420 has 24 divisors (see below), whose sum is σ = 1180251744. Its totient is φ = 168607296.

The previous prime is 491771411. The next prime is 491771459. The reversal of 491771420 is 24177194.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 1756187 + ... + 1756466.

It is an arithmetic number, because the mean of its divisors is an integer number (49177156).

Almost surely, 2^491771420 is an apocalyptic number.

It is an amenable number.

491771420 is an abundant number, since it is smaller than the sum of its proper divisors (688480324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491771420 is a wasteful number, since it uses less digits than its factorization.

491771420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3512669 (or 3512667 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 491771420 is about 22175.9198230874. The cubic root of 491771420 is about 789.3224014045.

The spelling of 491771420 in words is "four hundred ninety-one million, seven hundred seventy-one thousand, four hundred twenty".