1391119993 has 2 divisors, whose sum is σ = 1391119994. Its totient is φ = 1391119992.

The previous prime is 1391119987. The next prime is 1391119997. The reversal of 1391119993 is 3999111931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1132457104 + 258662889 = 33652^2 + 16083^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391119993 - 2¹³ = 1391111801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1391119997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695559996 + 695559997.

It is an arithmetic number, because the mean of its divisors is an integer number (695559997).

Almost surely, 2^1391119993 is an apocalyptic number.

It is an amenable number.

1391119993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391119993 is an equidigital number, since it uses as much as digits as its factorization.

1391119993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 59049, while the sum is 46.

The square root of 1391119993 is about 37297.7210161693. The cubic root of 1391119993 is about 1116.3186936955.

The spelling of 1391119993 in words is "one billion, three hundred ninety-one million, one hundred nineteen thousand, nine hundred ninety-three".