491641459 has 4 divisors (see below), whose sum is σ = 504929104. Its totient is φ = 478353816.

The previous prime is 491641441. The next prime is 491641463. The reversal of 491641459 is 954146194.

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

It is a cyclic number.

It is not a de Polignac number, because 491641459 - 2¹³ = 491633267 is a prime.

It is a super-2 number, since 2×491641459² = 483422648415297362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491641499) 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, 6643767 + ... + 6643840.

It is an arithmetic number, because the mean of its divisors is an integer number (126232276).

Almost surely, 2^491641459 is an apocalyptic number.

491641459 is a deficient number, since it is larger than the sum of its proper divisors (13287645).

491641459 is a wasteful number, since it uses less digits than its factorization.

491641459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13287644.

The product of its digits is 155520, while the sum is 43.

The square root of 491641459 is about 22172.9894015218. The cubic root of 491641459 is about 789.2528635649.

The spelling of 491641459 in words is "four hundred ninety-one million, six hundred forty-one thousand, four hundred fifty-nine".