990655949 has 2 divisors, whose sum is σ = 990655950. Its totient is φ = 990655948.

The previous prime is 990655907. The next prime is 990655951. The reversal of 990655949 is 949556099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 861833449 + 128822500 = 29357^2 + 11350^2 .

It is a cyclic number.

It is not a de Polignac number, because 990655949 - 2⁸ = 990655693 is a prime.

Together with 990655951, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 990655894 and 990655903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990655999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495327974 + 495327975.

It is an arithmetic number, because the mean of its divisors is an integer number (495327975).

Almost surely, 2^990655949 is an apocalyptic number.

It is an amenable number.

990655949 is a deficient number, since it is larger than the sum of its proper divisors (1).

990655949 is an equidigital number, since it uses as much as digits as its factorization.

990655949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3936600, while the sum is 56.

The square root of 990655949 is about 31474.6874329198. The cubic root of 990655949 is about 996.8755644025.

The spelling of 990655949 in words is "nine hundred ninety million, six hundred fifty-five thousand, nine hundred forty-nine".