491481389194 has 8 divisors (see below), whose sum is σ = 749307691908. Its totient is φ = 241712158560.

The previous prime is 491481389149. The next prime is 491481389197. The reversal of 491481389194 is 491983184194.

It can be written as a sum of positive squares in 2 ways, for example, as 409005016225 + 82476372969 = 639535^2 + 287187^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (61).

It is not an unprimeable number, because it can be changed into a prime (491481389197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2014267867 + ... + 2014268110.

Almost surely, 2^491481389194 is an apocalyptic number.

491481389194 is a deficient number, since it is larger than the sum of its proper divisors (257826302714).

491481389194 is a wasteful number, since it uses less digits than its factorization.

491481389194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4028536040.

The product of its digits is 8957952, while the sum is 61.

The spelling of 491481389194 in words is "four hundred ninety-one billion, four hundred eighty-one million, three hundred eighty-nine thousand, one hundred ninety-four".