121553 has 2 divisors, whose sum is σ = 121554. Its totient is φ = 121552.

The previous prime is 121547. The next prime is 121559. The reversal of 121553 is 355121.

121553 is nontrivially palindromic in base 16.

It is a balanced prime because it is at equal distance from previous prime (121547) and next prime (121559).

It can be written as a sum of positive squares in only one way, i.e., 71824 + 49729 = 268^2 + 223^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121553 is a prime.

It is not a weakly prime, because it can be changed into another prime (121559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60776 + 60777.

It is an arithmetic number, because the mean of its divisors is an integer number (60777).

2¹²¹⁵⁵³ is an apocalyptic number.

It is an amenable number.

121553 is a deficient number, since it is larger than the sum of its proper divisors (1).

121553 is an equidigital number, since it uses as much as digits as its factorization.

121553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150, while the sum is 17.

The square root of 121553 is about 348.6445180983. The cubic root of 121553 is about 49.5361094208.

Adding to 121553 its reverse (355121), we get a palindrome (476674).

The spelling of 121553 in words is "one hundred twenty-one thousand, five hundred fifty-three".