491699165 has 16 divisors (see below), whose sum is σ = 602548848. Its totient is φ = 385099776.

The previous prime is 491699123. The next prime is 491699191. The reversal of 491699165 is 561996194.

It can be written as a sum of positive squares in 8 ways, for example, as 145924 + 491553241 = 382^2 + 22171^2 .

It is a cyclic number.

It is not a de Polignac number, because 491699165 - 2²⁴ = 474921949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45089 + ... + 54921.

It is an arithmetic number, because the mean of its divisors is an integer number (37659303).

Almost surely, 2^491699165 is an apocalyptic number.

It is an amenable number.

491699165 is a deficient number, since it is larger than the sum of its proper divisors (110849683).

491699165 is a wasteful number, since it uses less digits than its factorization.

491699165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10048.

The product of its digits is 524880, while the sum is 50.

The square root of 491699165 is about 22174.2906312694. The cubic root of 491699165 is about 789.2837416524.

The spelling of 491699165 in words is "four hundred ninety-one million, six hundred ninety-nine thousand, one hundred sixty-five".