491435381 has 8 divisors (see below), whose sum is σ = 493545120. Its totient is φ = 489331152.

The previous prime is 491435377. The next prime is 491435401. The reversal of 491435381 is 183534194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491435381 - 2² = 491435377 is a prime.

It is a super-2 number, since 2×491435381² = 483017467397230322, 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 (491435311) by changing a digit.

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, 293615 + ... + 295283.

It is an arithmetic number, because the mean of its divisors is an integer number (61693140).

Almost surely, 2^491435381 is an apocalyptic number.

It is an amenable number.

491435381 is a deficient number, since it is larger than the sum of its proper divisors (2109739).

491435381 is a wasteful number, since it uses less digits than its factorization.

491435381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2755.

The product of its digits is 51840, while the sum is 38.

The square root of 491435381 is about 22168.3418640186. The cubic root of 491435381 is about 789.1425729054.

The spelling of 491435381 in words is "four hundred ninety-one million, four hundred thirty-five thousand, three hundred eighty-one".