1913489909 has 2 divisors, whose sum is σ = 1913489910. Its totient is φ = 1913489908.

The previous prime is 1913489887. The next prime is 1913489939. The reversal of 1913489909 is 9099843191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1402277809 + 511212100 = 37447^2 + 22610^2 .

It is a cyclic number.

It is not a de Polignac number, because 1913489909 - 2⁸ = 1913489653 is a prime.

It is a super-2 number, since 2×1913489909² = 7322887263689656562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1913489939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956744954 + 956744955.

It is an arithmetic number, because the mean of its divisors is an integer number (956744955).

Almost surely, 2^1913489909 is an apocalyptic number.

It is an amenable number.

1913489909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1913489909 is an equidigital number, since it uses as much as digits as its factorization.

1913489909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 53.

The square root of 1913489909 is about 43743.4556133829. The cubic root of 1913489909 is about 1241.4866640396.

The spelling of 1913489909 in words is "one billion, nine hundred thirteen million, four hundred eighty-nine thousand, nine hundred nine".