121751671609 has 2 divisors, whose sum is σ = 121751671610. Its totient is φ = 121751671608.

The previous prime is 121751671567. The next prime is 121751671627. The reversal of 121751671609 is 906176157121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120320184384 + 1431487225 = 346872^2 + 37835^2 .

It is a cyclic number.

It is not a de Polignac number, because 121751671609 - 2¹¹ = 121751669561 is a prime.

It is not a weakly prime, because it can be changed into another prime (121751674609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60875835804 + 60875835805.

It is an arithmetic number, because the mean of its divisors is an integer number (60875835805).

Almost surely, 2^121751671609 is an apocalyptic number.

It is an amenable number.

121751671609 is a deficient number, since it is larger than the sum of its proper divisors (1).

121751671609 is an equidigital number, since it uses as much as digits as its factorization.

121751671609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 46.

The spelling of 121751671609 in words is "one hundred twenty-one billion, seven hundred fifty-one million, six hundred seventy-one thousand, six hundred nine".