1913506789 has 2 divisors, whose sum is σ = 1913506790. Its totient is φ = 1913506788.

The previous prime is 1913506769. The next prime is 1913506807. The reversal of 1913506789 is 9876053191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1106094564 + 807412225 = 33258^2 + 28415^2 .

It is a cyclic number.

It is not a de Polignac number, because 1913506789 - 2¹⁹ = 1912982501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1913506759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956753394 + 956753395.

It is an arithmetic number, because the mean of its divisors is an integer number (956753395).

Almost surely, 2^1913506789 is an apocalyptic number.

It is an amenable number.

1913506789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1913506789 is an equidigital number, since it uses as much as digits as its factorization.

1913506789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 49.

The square root of 1913506789 is about 43743.6485561047. The cubic root of 1913506789 is about 1241.4903146526.

The spelling of 1913506789 in words is "one billion, nine hundred thirteen million, five hundred six thousand, seven hundred eighty-nine".