990761549 has 2 divisors, whose sum is σ = 990761550. Its totient is φ = 990761548.

The previous prime is 990761521. The next prime is 990761579. The reversal of 990761549 is 945167099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 869365225 + 121396324 = 29485^2 + 11018^2 .

It is an emirp because it is prime and its reverse (945167099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990761549 - 2⁸ = 990761293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 990761497 and 990761506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990761579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495380774 + 495380775.

It is an arithmetic number, because the mean of its divisors is an integer number (495380775).

Almost surely, 2^990761549 is an apocalyptic number.

It is an amenable number.

990761549 is a deficient number, since it is larger than the sum of its proper divisors (1).

990761549 is an equidigital number, since it uses as much as digits as its factorization.

990761549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 990761549 is about 31476.3649267192. The cubic root of 990761549 is about 996.9109841395.

The spelling of 990761549 in words is "nine hundred ninety million, seven hundred sixty-one thousand, five hundred forty-nine".