990756553 has 2 divisors, whose sum is σ = 990756554. Its totient is φ = 990756552.

The previous prime is 990756527. The next prime is 990756589. The reversal of 990756553 is 355657099.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 743543824 + 247212729 = 27268^2 + 15723^2 .

It is a cyclic number.

It is not a de Polignac number, because 990756553 - 2¹⁷ = 990625481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 990756497 and 990756506.

It is not a weakly prime, because it can be changed into another prime (990756523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495378276 + 495378277.

It is an arithmetic number, because the mean of its divisors is an integer number (495378277).

Almost surely, 2^990756553 is an apocalyptic number.

It is an amenable number.

990756553 is a deficient number, since it is larger than the sum of its proper divisors (1).

990756553 is an equidigital number, since it uses as much as digits as its factorization.

990756553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1275750, while the sum is 49.

The square root of 990756553 is about 31476.2855654856. The cubic root of 990756553 is about 996.9093084670.

The spelling of 990756553 in words is "nine hundred ninety million, seven hundred fifty-six thousand, five hundred fifty-three".