491258081 has 4 divisors (see below), whose sum is σ = 512617152. Its totient is φ = 469899012.

The previous prime is 491258063. The next prime is 491258083. The reversal of 491258081 is 180852194.

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 a cyclic number.

It is not a de Polignac number, because 491258081 - 2¹⁸ = 490995937 is a prime.

It is a super-2 number, since 2×491258081² = 482669004295605122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491258083) 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, 10679501 + ... + 10679546.

It is an arithmetic number, because the mean of its divisors is an integer number (128154288).

Almost surely, 2^491258081 is an apocalyptic number.

It is an amenable number.

491258081 is a deficient number, since it is larger than the sum of its proper divisors (21359071).

491258081 is a wasteful number, since it uses less digits than its factorization.

491258081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21359070.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 491258081 is about 22164.3425573600. The cubic root of 491258081 is about 789.0476592348.

The spelling of 491258081 in words is "four hundred ninety-one million, two hundred fifty-eight thousand, eighty-one".