121751531129 has 2 divisors, whose sum is σ = 121751531130. Its totient is φ = 121751531128.

The previous prime is 121751531117. The next prime is 121751531147. The reversal of 121751531129 is 921135157121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119268003904 + 2483527225 = 345352^2 + 49835^2 .

It is a cyclic number.

It is not a de Polignac number, because 121751531129 - 2¹⁶ = 121751465593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121751531092 and 121751531101.

It is not a weakly prime, because it can be changed into another prime (121751531149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60875765564 + 60875765565.

It is an arithmetic number, because the mean of its divisors is an integer number (60875765565).

Almost surely, 2^121751531129 is an apocalyptic number.

It is an amenable number.

121751531129 is a deficient number, since it is larger than the sum of its proper divisors (1).

121751531129 is an equidigital number, since it uses as much as digits as its factorization.

121751531129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 38.

The spelling of 121751531129 in words is "one hundred twenty-one billion, seven hundred fifty-one million, five hundred thirty-one thousand, one hundred twenty-nine".