491593363381 has 32 divisors (see below), whose sum is σ = 518535561600. Its totient is φ = 465413894400.

The previous prime is 491593363379. The next prime is 491593363427. The reversal of 491593363381 is 183363395194.

It is a cyclic number.

It is not a de Polignac number, because 491593363381 - 2¹ = 491593363379 is a prime.

It is a super-2 number, since 2×491593363381² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491593367381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 377857431 + ... + 377858731.

It is an arithmetic number, because the mean of its divisors is an integer number (16204236300).

Almost surely, 2^491593363381 is an apocalyptic number.

It is an amenable number.

491593363381 is a deficient number, since it is larger than the sum of its proper divisors (26942198219).

491593363381 is a wasteful number, since it uses less digits than its factorization.

491593363381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469.

The product of its digits is 6298560, while the sum is 55.

The spelling of 491593363381 in words is "four hundred ninety-one billion, five hundred ninety-three million, three hundred sixty-three thousand, three hundred eighty-one".