121197772789 has 2 divisors, whose sum is σ = 121197772790. Its totient is φ = 121197772788.

The previous prime is 121197772769. The next prime is 121197772811. The reversal of 121197772789 is 987277791121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81927612900 + 39270159889 = 286230^2 + 198167^2 .

It is a cyclic number.

It is not a de Polignac number, because 121197772789 - 2⁹ = 121197772277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121197772769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60598886394 + 60598886395.

It is an arithmetic number, because the mean of its divisors is an integer number (60598886395).

Almost surely, 2^121197772789 is an apocalyptic number.

It is an amenable number.

121197772789 is a deficient number, since it is larger than the sum of its proper divisors (1).

121197772789 is an equidigital number, since it uses as much as digits as its factorization.

121197772789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6223392, while the sum is 61.

The spelling of 121197772789 in words is "one hundred twenty-one billion, one hundred ninety-seven million, seven hundred seventy-two thousand, seven hundred eighty-nine".