491297651 has 8 divisors (see below), whose sum is σ = 539073360. Its totient is φ = 444948192.

The previous prime is 491297621. The next prime is 491297657. The reversal of 491297651 is 156792194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491297651 - 2¹⁸ = 491035507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491297657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355841 + ... + 357218.

It is an arithmetic number, because the mean of its divisors is an integer number (67384170).

Almost surely, 2^491297651 is an apocalyptic number.

491297651 is a deficient number, since it is larger than the sum of its proper divisors (47775709).

491297651 is a wasteful number, since it uses less digits than its factorization.

491297651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713125.

The product of its digits is 136080, while the sum is 44.

The square root of 491297651 is about 22165.2351893681. The cubic root of 491297651 is about 789.0688441468.

The spelling of 491297651 in words is "four hundred ninety-one million, two hundred ninety-seven thousand, six hundred fifty-one".