491097601 has 4 divisors (see below), whose sum is σ = 491142100. Its totient is φ = 491053104.

The previous prime is 491097589. The next prime is 491097611. The reversal of 491097601 is 106790194.

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 2 ways, for example, as 206669376 + 284428225 = 14376^2 + 16865^2 .

It is a cyclic number.

It is not a de Polignac number, because 491097601 - 2⁷ = 491097473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491097611) 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, 8155 + ... + 32383.

It is an arithmetic number, because the mean of its divisors is an integer number (122785525).

Almost surely, 2^491097601 is an apocalyptic number.

It is an amenable number.

491097601 is a deficient number, since it is larger than the sum of its proper divisors (44499).

491097601 is a wasteful number, since it uses less digits than its factorization.

491097601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44498.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 491097601 is about 22160.7220324609. The cubic root of 491097601 is about 788.9617300907.

The spelling of 491097601 in words is "four hundred ninety-one million, ninety-seven thousand, six hundred one".