121788481 has 2 divisors, whose sum is σ = 121788482. Its totient is φ = 121788480.

The previous prime is 121788437. The next prime is 121788521. The reversal of 121788481 is 184887121.

It is an a-pointer prime, because the next prime (121788521) can be obtained adding 121788481 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64256256 + 57532225 = 8016^2 + 7585^2 .

It is a cyclic number.

It is not a de Polignac number, because 121788481 - 2⁹ = 121787969 is a prime.

It is a super-2 number, since 2×121788481² = 29664868208574722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121788281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60894240 + 60894241.

It is an arithmetic number, because the mean of its divisors is an integer number (60894241).

Almost surely, 2^121788481 is an apocalyptic number.

It is an amenable number.

121788481 is a deficient number, since it is larger than the sum of its proper divisors (1).

121788481 is an equidigital number, since it uses as much as digits as its factorization.

121788481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28672, while the sum is 40.

The square root of 121788481 is about 11035.7818481519. The cubic root of 121788481 is about 495.6807706197.

It can be divided in two parts, 1217 and 88481, that added together give a palindrome (89698).

The spelling of 121788481 in words is "one hundred twenty-one million, seven hundred eighty-eight thousand, four hundred eighty-one".