1391944612641 has 32 divisors (see below), whose sum is σ = 2088949685760. Its totient is φ = 817105948800.

The previous prime is 1391944612607. The next prime is 1391944612691. The reversal of 1391944612641 is 1462164491931.

It is a de Polignac number, because none of the positive numbers 2^k-1391944612641 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1391944612691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3512595 + ... + 3888728.

It is an arithmetic number, because the mean of its divisors is an integer number (65279677680).

Almost surely, 2^{1391944612641} is an apocalyptic number.

1391944612641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1391944612641 is a deficient number, since it is larger than the sum of its proper divisors (697005073119).

1391944612641 is a wasteful number, since it uses less digits than its factorization.

1391944612641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7401517.

The product of its digits is 1119744, while the sum is 51.

The spelling of 1391944612641 in words is "one trillion, three hundred ninety-one billion, nine hundred forty-four million, six hundred twelve thousand, six hundred forty-one".