1491326423999 has 8 divisors (see below), whose sum is σ = 1569838854000. Its totient is φ = 1412816150592.

The previous prime is 1491326423963. The next prime is 1491326424011. The reversal of 1491326423999 is 9993246231941.

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

It is not a de Polignac number, because 1491326423999 - 2⁴⁰ = 391814796223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491326423959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 991787 + ... + 1991555.

It is an arithmetic number, because the mean of its divisors is an integer number (196229856750).

Almost surely, 2^{1491326423999} is an apocalyptic number.

1491326423999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1491326423999 is a deficient number, since it is larger than the sum of its proper divisors (78512430001).

1491326423999 is an equidigital number, since it uses as much as digits as its factorization.

1491326423999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078297.

The product of its digits is 22674816, while the sum is 62.

The spelling of 1491326423999 in words is "one trillion, four hundred ninety-one billion, three hundred twenty-six million, four hundred twenty-three thousand, nine hundred ninety-nine".