1391912189 has 2 divisors, whose sum is σ = 1391912190. Its totient is φ = 1391912188.

The previous prime is 1391912177. The next prime is 1391912201. The reversal of 1391912189 is 9812191931.

It is a balanced prime because it is at equal distance from previous prime (1391912177) and next prime (1391912201).

It can be written as a sum of positive squares in only one way, i.e., 774787225 + 617124964 = 27835^2 + 24842^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391912189 - 2²⁴ = 1375134973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391911189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695956094 + 695956095.

It is an arithmetic number, because the mean of its divisors is an integer number (695956095).

Almost surely, 2^1391912189 is an apocalyptic number.

It is an amenable number.

1391912189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391912189 is an equidigital number, since it uses as much as digits as its factorization.

1391912189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 44.

The square root of 1391912189 is about 37308.3394028735. The cubic root of 1391912189 is about 1116.5305554552.

The spelling of 1391912189 in words is "one billion, three hundred ninety-one million, nine hundred twelve thousand, one hundred eighty-nine".