990655693 has 2 divisors, whose sum is σ = 990655694. Its totient is φ = 990655692.

The previous prime is 990655691. The next prime is 990655697. The reversal of 990655693 is 396556099.

990655693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 910409929 + 80245764 = 30173^2 + 8958^2 .

It is an emirp because it is prime and its reverse (396556099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990655693 - 2¹ = 990655691 is a prime.

Together with 990655691, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 990655693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990655691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495327846 + 495327847.

It is an arithmetic number, because the mean of its divisors is an integer number (495327847).

Almost surely, 2^990655693 is an apocalyptic number.

It is an amenable number.

990655693 is a deficient number, since it is larger than the sum of its proper divisors (1).

990655693 is an equidigital number, since it uses as much as digits as its factorization.

990655693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1968300, while the sum is 52.

The square root of 990655693 is about 31474.6833661595. The cubic root of 990655693 is about 996.8754785335.

The spelling of 990655693 in words is "nine hundred ninety million, six hundred fifty-five thousand, six hundred ninety-three".