491321029547 has 2 divisors, whose sum is σ = 491321029548. Its totient is φ = 491321029546.

The previous prime is 491321029499. The next prime is 491321029553. The reversal of 491321029547 is 745920123194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491321029547 - 2¹² = 491321025451 is a prime.

It is not a weakly prime, because it can be changed into another prime (491321029567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245660514773 + 245660514774.

It is an arithmetic number, because the mean of its divisors is an integer number (245660514774).

Almost surely, 2^491321029547 is an apocalyptic number.

491321029547 is a deficient number, since it is larger than the sum of its proper divisors (1).

491321029547 is an equidigital number, since it uses as much as digits as its factorization.

491321029547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 491321029547 in words is "four hundred ninety-one billion, three hundred twenty-one million, twenty-nine thousand, five hundred forty-seven".