491975351 has 4 divisors (see below), whose sum is σ = 562257552. Its totient is φ = 421693152.

The previous prime is 491975333. The next prime is 491975369. The reversal of 491975351 is 153579194.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (491975333) and next prime (491975369).

It is a cyclic number.

It is not a de Polignac number, because 491975351 - 2⁶ = 491975287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491975371) 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, 35141090 + ... + 35141103.

It is an arithmetic number, because the mean of its divisors is an integer number (140564388).

Almost surely, 2^491975351 is an apocalyptic number.

491975351 is a deficient number, since it is larger than the sum of its proper divisors (70282201).

491975351 is an equidigital number, since it uses as much as digits as its factorization.

491975351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70282200.

The product of its digits is 170100, while the sum is 44.

The square root of 491975351 is about 22180.5173744888. The cubic root of 491975351 is about 789.4314934575.

The spelling of 491975351 in words is "four hundred ninety-one million, nine hundred seventy-five thousand, three hundred fifty-one".