121451551553 has 2 divisors, whose sum is σ = 121451551554. Its totient is φ = 121451551552.

The previous prime is 121451551489. The next prime is 121451551601. The reversal of 121451551553 is 355155154121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97348368049 + 24103183504 = 312007^2 + 155252^2 .

It is a cyclic number.

It is not a de Polignac number, because 121451551553 - 2⁶ = 121451551489 is a prime.

It is not a weakly prime, because it can be changed into another prime (121451551253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60725775776 + 60725775777.

It is an arithmetic number, because the mean of its divisors is an integer number (60725775777).

Almost surely, 2^121451551553 is an apocalyptic number.

It is an amenable number.

121451551553 is a deficient number, since it is larger than the sum of its proper divisors (1).

121451551553 is an equidigital number, since it uses as much as digits as its factorization.

121451551553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75000, while the sum is 38.

The spelling of 121451551553 in words is "one hundred twenty-one billion, four hundred fifty-one million, five hundred fifty-one thousand, five hundred fifty-three".