491067765 has 48 divisors (see below), whose sum is σ = 885830400. Its totient is φ = 260978112.

The previous prime is 491067743. The next prime is 491067767. The reversal of 491067765 is 567760194.

It is a happy number.

It is not a de Polignac number, because 491067765 - 2⁷ = 491067637 is a prime.

It is a super-2 number, since 2×491067765² = 482295099644190450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 491067765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491067767) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 472116 + ... + 473154.

It is an arithmetic number, because the mean of its divisors is an integer number (18454800).

Almost surely, 2^491067765 is an apocalyptic number.

491067765 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

491067765 is a deficient number, since it is larger than the sum of its proper divisors (394762635).

491067765 is a wasteful number, since it uses less digits than its factorization.

491067765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448 (or 1436 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 491067765 is about 22160.0488492241. The cubic root of 491067765 is about 788.9457523171.

The spelling of 491067765 in words is "four hundred ninety-one million, sixty-seven thousand, seven hundred sixty-five".