491357429 has 4 divisors (see below), whose sum is σ = 491755884. Its totient is φ = 490958976.

The previous prime is 491357401. The next prime is 491357497. The reversal of 491357429 is 924753194.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 346034404 + 145323025 = 18602^2 + 12055^2 .

It is a cyclic number.

It is not a de Polignac number, because 491357429 - 2²⁰ = 490308853 is a prime.

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 491357429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491351429) 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, 197372 + ... + 199845.

It is an arithmetic number, because the mean of its divisors is an integer number (122938971).

Almost surely, 2^491357429 is an apocalyptic number.

It is an amenable number.

491357429 is a deficient number, since it is larger than the sum of its proper divisors (398455).

491357429 is a wasteful number, since it uses less digits than its factorization.

491357429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398454.

The product of its digits is 272160, while the sum is 44.

The square root of 491357429 is about 22166.5836113732. The cubic root of 491357429 is about 789.1008458225.

The spelling of 491357429 in words is "four hundred ninety-one million, three hundred fifty-seven thousand, four hundred twenty-nine".