121751558417 has 2 divisors, whose sum is σ = 121751558418. Its totient is φ = 121751558416.

The previous prime is 121751558387. The next prime is 121751558431. The reversal of 121751558417 is 714855157121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117326115841 + 4425442576 = 342529^2 + 66524^2 .

It is a cyclic number.

It is not a de Polignac number, because 121751558417 - 2²⁶ = 121684449553 is a prime.

It is a super-3 number, since 3×121751558417³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (121751558017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60875779208 + 60875779209.

It is an arithmetic number, because the mean of its divisors is an integer number (60875779209).

Almost surely, 2^121751558417 is an apocalyptic number.

It is an amenable number.

121751558417 is a deficient number, since it is larger than the sum of its proper divisors (1).

121751558417 is an equidigital number, since it uses as much as digits as its factorization.

121751558417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 392000, while the sum is 47.

The spelling of 121751558417 in words is "one hundred twenty-one billion, seven hundred fifty-one million, five hundred fifty-eight thousand, four hundred seventeen".