990971929 has 2 divisors, whose sum is σ = 990971930. Its totient is φ = 990971928.

The previous prime is 990971873. The next prime is 990971957. The reversal of 990971929 is 929179099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 771339529 + 219632400 = 27773^2 + 14820^2 .

It is an emirp because it is prime and its reverse (929179099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990971929 - 2⁷ = 990971801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 990971929.

It is not a weakly prime, because it can be changed into another prime (990971959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495485964 + 495485965.

It is an arithmetic number, because the mean of its divisors is an integer number (495485965).

Almost surely, 2^990971929 is an apocalyptic number.

It is an amenable number.

990971929 is a deficient number, since it is larger than the sum of its proper divisors (1).

990971929 is an equidigital number, since it uses as much as digits as its factorization.

990971929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 826686, while the sum is 55.

The square root of 990971929 is about 31479.7066218858. The cubic root of 990971929 is about 996.9815410729.

The spelling of 990971929 in words is "nine hundred ninety million, nine hundred seventy-one thousand, nine hundred twenty-nine".