1491734515787 has 4 divisors (see below), whose sum is σ = 1491739984560. Its totient is φ = 1491729047016.

The previous prime is 1491734515753. The next prime is 1491734515801. The reversal of 1491734515787 is 7875154371941.

It is a happy number.

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 1491734515787 - 2¹⁸ = 1491734253643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1491734515987) 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, 2302487 + ... + 2878352.

It is an arithmetic number, because the mean of its divisors is an integer number (372934996140).

Almost surely, 2^{1491734515787} is an apocalyptic number.

1491734515787 is a deficient number, since it is larger than the sum of its proper divisors (5468773).

1491734515787 is an equidigital number, since it uses as much as digits as its factorization.

1491734515787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5468772.

The product of its digits is 29635200, while the sum is 62.

The spelling of 1491734515787 in words is "one trillion, four hundred ninety-one billion, seven hundred thirty-four million, five hundred fifteen thousand, seven hundred eighty-seven".