491025517 has 4 divisors (see below), whose sum is σ = 491898240. Its totient is φ = 490152796.

The previous prime is 491025503. The next prime is 491025529. The reversal of 491025517 is 715520194.

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 491025517 - 2¹¹ = 491023469 is a prime.

It is a super-2 number, since 2×491025517² = 482212116690234578, 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 (491025547) 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, 435517 + ... + 436642.

It is an arithmetic number, because the mean of its divisors is an integer number (122974560).

Almost surely, 2^491025517 is an apocalyptic number.

It is an amenable number.

491025517 is a deficient number, since it is larger than the sum of its proper divisors (872723).

491025517 is an equidigital number, since it uses as much as digits as its factorization.

491025517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872722.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 491025517 is about 22159.0955817244. The cubic root of 491025517 is about 788.9231265626.

The spelling of 491025517 in words is "four hundred ninety-one million, twenty-five thousand, five hundred seventeen".