491373769 has 4 divisors (see below), whose sum is σ = 494388496. Its totient is φ = 488359044.

The previous prime is 491373761. The next prime is 491373809. The reversal of 491373769 is 967373194.

It is a happy number.

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 491373769 - 2³ = 491373761 is a prime.

It is a super-2 number, since 2×491373769² = 482896361722530722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491373761) 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, 1507119 + ... + 1507444.

It is an arithmetic number, because the mean of its divisors is an integer number (123597124).

Almost surely, 2^491373769 is an apocalyptic number.

It is an amenable number.

491373769 is a deficient number, since it is larger than the sum of its proper divisors (3014727).

491373769 is a wasteful number, since it uses less digits than its factorization.

491373769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014726.

The product of its digits is 857304, while the sum is 49.

The square root of 491373769 is about 22166.9521811186. The cubic root of 491373769 is about 789.1095928596.

The spelling of 491373769 in words is "four hundred ninety-one million, three hundred seventy-three thousand, seven hundred sixty-nine".