491335010397 has 36 divisors (see below), whose sum is σ = 884861648736. Its totient is φ = 255229380720.

The previous prime is 491335010351. The next prime is 491335010407. The reversal of 491335010397 is 793010533194.

491335010397 is a `hidden beast` number, since 4 + 9 + 133 + 501 + 0 + 3 + 9 + 7 = 666.

It is not a de Polignac number, because 491335010397 - 2⁸ = 491335010141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491335010317) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18439198 + ... + 18465824.

Almost surely, 2^491335010397 is an apocalyptic number.

It is an amenable number.

491335010397 is a deficient number, since it is larger than the sum of its proper divisors (393526638339).

491335010397 is an frugal number, since it uses more digits than its factorization.

491335010397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53278 (or 26648 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 45.

The spelling of 491335010397 in words is "four hundred ninety-one billion, three hundred thirty-five million, ten thousand, three hundred ninety-seven".