121801663 has 2 divisors, whose sum is σ = 121801664. Its totient is φ = 121801662.

The previous prime is 121801643. The next prime is 121801679. The reversal of 121801663 is 366108121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121801663 - 2²¹ = 119704511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121801643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60900831 + 60900832.

It is an arithmetic number, because the mean of its divisors is an integer number (60900832).

Almost surely, 2^121801663 is an apocalyptic number.

121801663 is a deficient number, since it is larger than the sum of its proper divisors (1).

121801663 is an equidigital number, since it uses as much as digits as its factorization.

121801663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 121801663 is about 11036.3790710541. The cubic root of 121801663 is about 495.6986536141.

Adding to 121801663 its reverse (366108121), we get a palindrome (487909784).

The spelling of 121801663 in words is "one hundred twenty-one million, eight hundred one thousand, six hundred sixty-three".