1491481523911 has 4 divisors (see below), whose sum is σ = 1492091040672. Its totient is φ = 1490872007152.

The previous prime is 1491481523899. The next prime is 1491481523923. The reversal of 1491481523911 is 1193251841941.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1491481523899) and next prime (1491481523923).

It is a cyclic number.

It is not a de Polignac number, because 1491481523911 - 2⁷ = 1491481523783 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491481523951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304754710 + ... + 304759603.

It is an arithmetic number, because the mean of its divisors is an integer number (373022760168).

Almost surely, 2^{1491481523911} is an apocalyptic number.

1491481523911 is a deficient number, since it is larger than the sum of its proper divisors (609516761).

1491481523911 is an equidigital number, since it uses as much as digits as its factorization.

1491481523911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609516760.

The product of its digits is 311040, while the sum is 49.

The spelling of 1491481523911 in words is "one trillion, four hundred ninety-one billion, four hundred eighty-one million, five hundred twenty-three thousand, nine hundred eleven".