121355623 has 2 divisors, whose sum is σ = 121355624. Its totient is φ = 121355622.

The previous prime is 121355609. The next prime is 121355629. The reversal of 121355623 is 326553121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121355623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121355591 and 121355600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121355629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60677811 + 60677812.

It is an arithmetic number, because the mean of its divisors is an integer number (60677812).

Almost surely, 2^121355623 is an apocalyptic number.

121355623 is a deficient number, since it is larger than the sum of its proper divisors (1).

121355623 is an equidigital number, since it uses as much as digits as its factorization.

121355623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 28.

The square root of 121355623 is about 11016.1528221063. The cubic root of 121355623 is about 495.0928275387.

The spelling of 121355623 in words is "one hundred twenty-one million, three hundred fifty-five thousand, six hundred twenty-three".