491629 has 4 divisors (see below), whose sum is σ = 507520. Its totient is φ = 475740.

The previous prime is 491627. The next prime is 491633. The reversal of 491629 is 926194.

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 491629 - 2¹ = 491627 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 15859 = 491629 / (4 + 9 + 1 + 6 + 2 + 9).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491627) 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, 7899 + ... + 7960.

It is an arithmetic number, because the mean of its divisors is an integer number (126880).

2⁴⁹¹⁶²⁹ is an apocalyptic number.

It is an amenable number.

491629 is a deficient number, since it is larger than the sum of its proper divisors (15891).

491629 is a wasteful number, since it uses less digits than its factorization.

491629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15890.

The product of its digits is 3888, while the sum is 31.

The square root of 491629 is about 701.1626059624. The cubic root of 491629 is about 78.9246196522.

The spelling of 491629 in words is "four hundred ninety-one thousand, six hundred twenty-nine".