1491063015391 has 4 divisors (see below), whose sum is σ = 1491078743152. Its totient is φ = 1491047287632.

The previous prime is 1491063015383. The next prime is 1491063015401. The reversal of 1491063015391 is 1935103601941.

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 1491063015391 - 2³ = 1491063015383 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 (1491063015341) 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, 7720806 + ... + 7911571.

It is an arithmetic number, because the mean of its divisors is an integer number (372769685788).

Almost surely, 2^{1491063015391} is an apocalyptic number.

1491063015391 is a deficient number, since it is larger than the sum of its proper divisors (15727761).

1491063015391 is an equidigital number, since it uses as much as digits as its factorization.

1491063015391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15727760.

The product of its (nonzero) digits is 87480, while the sum is 43.

The spelling of 1491063015391 in words is "one trillion, four hundred ninety-one billion, sixty-three million, fifteen thousand, three hundred ninety-one".