913661789 has 2 divisors, whose sum is σ = 913661790. Its totient is φ = 913661788.

The previous prime is 913661773. The next prime is 913661813. The reversal of 913661789 is 987166319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 608460889 + 305200900 = 24667^2 + 17470^2 .

It is a cyclic number.

It is not a de Polignac number, because 913661789 - 2⁴ = 913661773 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (913660789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456830894 + 456830895.

It is an arithmetic number, because the mean of its divisors is an integer number (456830895).

Almost surely, 2^913661789 is an apocalyptic number.

It is an amenable number.

913661789 is a deficient number, since it is larger than the sum of its proper divisors (1).

913661789 is an equidigital number, since it uses as much as digits as its factorization.

913661789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The square root of 913661789 is about 30226.8388853350. The cubic root of 913661789 is about 970.3501725761.

The spelling of 913661789 in words is "nine hundred thirteen million, six hundred sixty-one thousand, seven hundred eighty-nine".