1913812889 has 2 divisors, whose sum is σ = 1913812890. Its totient is φ = 1913812888.

The previous prime is 1913812877. The next prime is 1913812907. The reversal of 1913812889 is 9882183191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1341024400 + 572788489 = 36620^2 + 23933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1913812889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1913812189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956906444 + 956906445.

It is an arithmetic number, because the mean of its divisors is an integer number (956906445).

Almost surely, 2^1913812889 is an apocalyptic number.

It is an amenable number.

1913812889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1913812889 is an equidigital number, since it uses as much as digits as its factorization.

1913812889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 50.

The square root of 1913812889 is about 43747.1472098467. The cubic root of 1913812889 is about 1241.5565107288.

The spelling of 1913812889 in words is "one billion, nine hundred thirteen million, eight hundred twelve thousand, eight hundred eighty-nine".