1491827311643 has 4 divisors (see below), whose sum is σ = 1496334343128. Its totient is φ = 1487320280160.

The previous prime is 1491827311619. The next prime is 1491827311649. The reversal of 1491827311643 is 3461137281941.

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

It is a cyclic number.

It is not a de Polignac number, because 1491827311643 - 2¹⁸ = 1491827049499 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1491827311591 and 1491827311600.

It is not an unprimeable number, because it can be changed into a prime (1491827311649) 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, 2253515246 + ... + 2253515907.

It is an arithmetic number, because the mean of its divisors is an integer number (374083585782).

Almost surely, 2^{1491827311643} is an apocalyptic number.

1491827311643 is a deficient number, since it is larger than the sum of its proper divisors (4507031485).

1491827311643 is an equidigital number, since it uses as much as digits as its factorization.

1491827311643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4507031484.

The product of its digits is 870912, while the sum is 50.

The spelling of 1491827311643 in words is "one trillion, four hundred ninety-one billion, eight hundred twenty-seven million, three hundred eleven thousand, six hundred forty-three".