121153553 has 2 divisors, whose sum is σ = 121153554. Its totient is φ = 121153552.

The previous prime is 121153541. The next prime is 121153579. The reversal of 121153553 is 355351121.

It is a happy number.

It is an a-pointer prime, because the next prime (121153579) can be obtained adding 121153553 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108847489 + 12306064 = 10433^2 + 3508^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121153553 is a prime.

It is not a weakly prime, because it can be changed into another prime (121153583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60576776 + 60576777.

It is an arithmetic number, because the mean of its divisors is an integer number (60576777).

Almost surely, 2^121153553 is an apocalyptic number.

It is an amenable number.

121153553 is a deficient number, since it is larger than the sum of its proper divisors (1).

121153553 is an equidigital number, since it uses as much as digits as its factorization.

121153553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2250, while the sum is 26.

The square root of 121153553 is about 11006.9774688604. The cubic root of 121153553 is about 494.8178808318.

The spelling of 121153553 in words is "one hundred twenty-one million, one hundred fifty-three thousand, five hundred fifty-three".