121116623 has 2 divisors, whose sum is σ = 121116624. Its totient is φ = 121116622.

The previous prime is 121116553. The next prime is 121116679. The reversal of 121116623 is 326611121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121116623 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121116223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60558311 + 60558312.

It is an arithmetic number, because the mean of its divisors is an integer number (60558312).

Almost surely, 2^121116623 is an apocalyptic number.

121116623 is a deficient number, since it is larger than the sum of its proper divisors (1).

121116623 is an equidigital number, since it uses as much as digits as its factorization.

121116623 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 121116623 is about 11005.2997687478. The cubic root of 121116623 is about 494.7675989625.

Adding to 121116623 its reverse (326611121), we get a palindrome (447727744).

The spelling of 121116623 in words is "one hundred twenty-one million, one hundred sixteen thousand, six hundred twenty-three".