990648623 has 2 divisors, whose sum is σ = 990648624. Its totient is φ = 990648622.

The previous prime is 990648583. The next prime is 990648643. The reversal of 990648623 is 326846099.

990648623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 990648623 - 2⁶ = 990648559 is a prime.

It is a super-2 number, since 2×990648623² = 1962769388503592258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990648643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495324311 + 495324312.

It is an arithmetic number, because the mean of its divisors is an integer number (495324312).

Almost surely, 2^990648623 is an apocalyptic number.

990648623 is a deficient number, since it is larger than the sum of its proper divisors (1).

990648623 is an equidigital number, since it uses as much as digits as its factorization.

990648623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 47.

The square root of 990648623 is about 31474.5710534711. The cubic root of 990648623 is about 996.8731070649.

The spelling of 990648623 in words is "nine hundred ninety million, six hundred forty-eight thousand, six hundred twenty-three".