1001209998977 has 2 divisors, whose sum is σ = 1001209998978. Its totient is φ = 1001209998976.

The previous prime is 1001209998959. The next prime is 1001209999043. The reversal of 1001209998977 is 7798999021001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660864940096 + 340345058881 = 812936^2 + 583391^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001209998977 - 2⁸ = 1001209998721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001209908977) 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, 500604999488 + 500604999489.

It is an arithmetic number, because the mean of its divisors is an integer number (500604999489).

Almost surely, 2^{1001209998977} is an apocalyptic number.

It is an amenable number.

1001209998977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001209998977 is an equidigital number, since it uses as much as digits as its factorization.

1001209998977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5143824, while the sum is 62.

The spelling of 1001209998977 in words is "one trillion, one billion, two hundred nine million, nine hundred ninety-eight thousand, nine hundred seventy-seven".