990535501 has 2 divisors, whose sum is σ = 990535502. Its totient is φ = 990535500.

The previous prime is 990535499. The next prime is 990535541. The reversal of 990535501 is 105535099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 641406276 + 349129225 = 25326^2 + 18685^2 .

It is a cyclic number.

It is not a de Polignac number, because 990535501 - 2¹ = 990535499 is a prime.

Together with 990535499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990535541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495267750 + 495267751.

It is an arithmetic number, because the mean of its divisors is an integer number (495267751).

Almost surely, 2^990535501 is an apocalyptic number.

It is an amenable number.

990535501 is a deficient number, since it is larger than the sum of its proper divisors (1).

990535501 is an equidigital number, since it uses as much as digits as its factorization.

990535501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30375, while the sum is 37.

The square root of 990535501 is about 31472.7739641742. The cubic root of 990535501 is about 996.8351613630.

The spelling of 990535501 in words is "nine hundred ninety million, five hundred thirty-five thousand, five hundred one".