1393443051891 has 16 divisors (see below), whose sum is σ = 2114949139200. Its totient is φ = 807793073120.

The previous prime is 1393443051887. The next prime is 1393443051893. The reversal of 1393443051891 is 1981503443931.

It is a happy number.

It is not a de Polignac number, because 1393443051891 - 2² = 1393443051887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1393443051893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 917945916 + ... + 917947433.

It is an arithmetic number, because the mean of its divisors is an integer number (132184321200).

Almost surely, 2^{1393443051891} is an apocalyptic number.

1393443051891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1393443051891 is a deficient number, since it is larger than the sum of its proper divisors (721506087309).

1393443051891 is a wasteful number, since it uses less digits than its factorization.

1393443051891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835893386.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 1393443051891 in words is "one trillion, three hundred ninety-three billion, four hundred forty-three million, fifty-one thousand, eight hundred ninety-one".