121623611 has 2 divisors, whose sum is σ = 121623612. Its totient is φ = 121623610.

The previous prime is 121623599. The next prime is 121623613. The reversal of 121623611 is 116326121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121623611 is a prime.

It is a Sophie Germain prime.

Together with 121623613, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121623613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60811805 + 60811806.

It is an arithmetic number, because the mean of its divisors is an integer number (60811806).

Almost surely, 2^121623611 is an apocalyptic number.

121623611 is a deficient number, since it is larger than the sum of its proper divisors (1).

121623611 is an equidigital number, since it uses as much as digits as its factorization.

121623611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

The square root of 121623611 is about 11028.3095259428. The cubic root of 121623611 is about 495.4569952321.

Adding to 121623611 its reverse (116326121), we get a palindrome (237949732).

The spelling of 121623611 in words is "one hundred twenty-one million, six hundred twenty-three thousand, six hundred eleven".