990695887 has 2 divisors, whose sum is σ = 990695888. Its totient is φ = 990695886.

The previous prime is 990695879. The next prime is 990695897. The reversal of 990695887 is 788596099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990695887 - 2³ = 990695879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990695807) 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, 495347943 + 495347944.

It is an arithmetic number, because the mean of its divisors is an integer number (495347944).

Almost surely, 2^990695887 is an apocalyptic number.

990695887 is a deficient number, since it is larger than the sum of its proper divisors (1).

990695887 is an equidigital number, since it uses as much as digits as its factorization.

990695887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9797760, while the sum is 61.

The square root of 990695887 is about 31475.3218728578. The cubic root of 990695887 is about 996.8889604698. Note that the first 3 decimals are identical.

The spelling of 990695887 in words is "nine hundred ninety million, six hundred ninety-five thousand, eight hundred eighty-seven".