491401 has 3 divisors (see below), whose sum is σ = 492103. Its totient is φ = 490700.

The previous prime is 491377. The next prime is 491417. The reversal of 491401 is 104194.

The square root of 491401 is 701.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 423801 + 67600 = 651^2 + 260^2 .

It is not a de Polignac number, because 491401 - 2⁷ = 491273 is a prime.

It is a Duffinian number.

491401 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (491461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 351 + ... + 1051.

2⁴⁹¹⁴⁰¹ is an apocalyptic number.

491401 is the 701-st square number.

491401 is the 351-st centered octagonal number.

It is an amenable number.

491401 is a deficient number, since it is larger than the sum of its proper divisors (702).

491401 is an frugal number, since it uses more digits than its factorization.

491401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The cubic root of 491401 is about 78.9124169575.

Multiplying 491401 by its product of nonzero digits (144), we get a square (70761744 = 8412²).

Adding to 491401 its reverse (104194), we get a palindrome (595595).

It can be divided in two parts, 49140 and 1, that added together give a triangular number (49141 = T₃₁₃).

The spelling of 491401 in words is "four hundred ninety-one thousand, four hundred one".