491068769 has 4 divisors (see below), whose sum is σ = 491163540. Its totient is φ = 490974000.

The previous prime is 491068757. The next prime is 491068771. The reversal of 491068769 is 967860194.

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

It can be written as a sum of positive squares in 2 ways, for example, as 357966400 + 133102369 = 18920^2 + 11537^2 .

It is a cyclic number.

It is not a de Polignac number, because 491068769 - 2²⁴ = 474291553 is a prime.

It is a super-2 number, since 2×491068769² = 482297071774350722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (491067769) 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, 39134 + ... + 50135.

It is an arithmetic number, because the mean of its divisors is an integer number (122790885).

Almost surely, 2^491068769 is an apocalyptic number.

It is an amenable number.

491068769 is a deficient number, since it is larger than the sum of its proper divisors (94771).

491068769 is an equidigital number, since it uses as much as digits as its factorization.

491068769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94770.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 491068769 is about 22160.0715025922. The cubic root of 491068769 is about 788.9462899896.

It can be divided in two parts, 49106 and 8769, that added together give a palindrome (57875).

The spelling of 491068769 in words is "four hundred ninety-one million, sixty-eight thousand, seven hundred sixty-nine".