491392248382161 has 45 divisors (see below), whose sum is σ = 853903242399801. Its totient is φ = 280794772478808.

The previous prime is 491392248382127. The next prime is 491392248382187. The reversal of 491392248382161 is 161283842293194.

It is a happy number.

The square root of 491392248382161 is 22167369.

It is a perfect power (a square), and thus also a powerful number.

491392248382161 is a `hidden beast` number, since 4 + 9 + 1 + 3 + 9 + 2 + 248 + 382 + 1 + 6 + 1 = 666.

It is not a de Polignac number, because 491392248382161 - 2⁹ = 491392248381649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (491392248382121) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1396368316 + ... + 1396720178.

Almost surely, 2^{491392248382161} is an apocalyptic number.

491392248382161 is the 22167369-th square number.

491392248382161 is the 11083685-th centered octagonal number.

It is an amenable number.

491392248382161 is a deficient number, since it is larger than the sum of its proper divisors (362510994017640).

491392248382161 is an frugal number, since it uses more digits than its factorization.

491392248382161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703752 (or 351873 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 63.

The spelling of 491392248382161 in words is "four hundred ninety-one trillion, three hundred ninety-two billion, two hundred forty-eight million, three hundred eighty-two thousand, one hundred sixty-one".