491348381 has 4 divisors (see below), whose sum is σ = 495099264. Its totient is φ = 487597500.

The previous prime is 491348371. The next prime is 491348411. The reversal of 491348381 is 183843194.

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, and also an emirpimes, since its reverse is a distinct semiprime: 183843194 = 2 ⋅91921597.

It is a cyclic number.

It is not a de Polignac number, because 491348381 - 2²² = 487154077 is a prime.

It is a super-2 number, since 2×491348381² = 482846463022642322, 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 (491348371) 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, 1875245 + ... + 1875506.

It is an arithmetic number, because the mean of its divisors is an integer number (123774816).

Almost surely, 2^491348381 is an apocalyptic number.

It is an amenable number.

491348381 is a deficient number, since it is larger than the sum of its proper divisors (3750883).

491348381 is a wasteful number, since it uses less digits than its factorization.

491348381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3750882.

The product of its digits is 82944, while the sum is 41.

The square root of 491348381 is about 22166.3795194434. The cubic root of 491348381 is about 789.0960022146.

The spelling of 491348381 in words is "four hundred ninety-one million, three hundred forty-eight thousand, three hundred eighty-one".