121671502609 has 2 divisors, whose sum is σ = 121671502610. Its totient is φ = 121671502608.

The previous prime is 121671502607. The next prime is 121671502633. The reversal of 121671502609 is 906205176121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107439728400 + 14231774209 = 327780^2 + 119297^2 .

It is a cyclic number.

It is not a de Polignac number, because 121671502609 - 2¹ = 121671502607 is a prime.

Together with 121671502607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121671502607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60835751304 + 60835751305.

It is an arithmetic number, because the mean of its divisors is an integer number (60835751305).

Almost surely, 2^121671502609 is an apocalyptic number.

It is an amenable number.

121671502609 is a deficient number, since it is larger than the sum of its proper divisors (1).

121671502609 is an equidigital number, since it uses as much as digits as its factorization.

121671502609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 121671502609 in words is "one hundred twenty-one billion, six hundred seventy-one million, five hundred two thousand, six hundred nine".