121001631165509 has 2 divisors, whose sum is σ = 121001631165510. Its totient is φ = 121001631165508.

The previous prime is 121001631165361. The next prime is 121001631165521. The reversal of 121001631165509 is 905561136100121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66141167129284 + 54860464036225 = 8132722^2 + 7406785^2 .

It is a cyclic number.

It is not a de Polignac number, because 121001631165509 - 2¹² = 121001631161413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121001631065509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500815582754 + 60500815582755.

It is an arithmetic number, because the mean of its divisors is an integer number (60500815582755).

Almost surely, 2^{121001631165509} is an apocalyptic number.

It is an amenable number.

121001631165509 is a deficient number, since it is larger than the sum of its proper divisors (1).

121001631165509 is an equidigital number, since it uses as much as digits as its factorization.

121001631165509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 41.

The spelling of 121001631165509 in words is "one hundred twenty-one trillion, one billion, six hundred thirty-one million, one hundred sixty-five thousand, five hundred nine".