990990127 has 2 divisors, whose sum is σ = 990990128. Its totient is φ = 990990126.

The previous prime is 990990107. The next prime is 990990149. The reversal of 990990127 is 721099099.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990990127 is a prime.

It is a super-2 number, since 2×990990127² = 1964122863622952258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990990107) 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, 495495063 + 495495064.

It is an arithmetic number, because the mean of its divisors is an integer number (495495064).

Almost surely, 2^990990127 is an apocalyptic number.

990990127 is a deficient number, since it is larger than the sum of its proper divisors (1).

990990127 is an equidigital number, since it uses as much as digits as its factorization.

990990127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 990990127 is about 31479.9956639133. The cubic root of 990990127 is about 996.9876438219.

Adding to 990990127 its product of nonzero digits (91854), we get a triangular number (991081981 = T₄₄₅₂₁).

The spelling of 990990127 in words is "nine hundred ninety million, nine hundred ninety thousand, one hundred twenty-seven".