491905351 has 4 divisors (see below), whose sum is σ = 562177552. Its totient is φ = 421633152.

The previous prime is 491905339. The next prime is 491905369. The reversal of 491905351 is 153509194.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 491905351 - 2¹¹ = 491903303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491905351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491905391) 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, 35136090 + ... + 35136103.

It is an arithmetic number, because the mean of its divisors is an integer number (140544388).

Almost surely, 2^491905351 is an apocalyptic number.

491905351 is a deficient number, since it is larger than the sum of its proper divisors (70272201).

491905351 is an equidigital number, since it uses as much as digits as its factorization.

491905351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70272200.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 491905351 is about 22178.9393569666. The cubic root of 491905351 is about 789.3940506429.

The spelling of 491905351 in words is "four hundred ninety-one million, nine hundred five thousand, three hundred fifty-one".