121623553 has 2 divisors, whose sum is σ = 121623554. Its totient is φ = 121623552.

The previous prime is 121623527. The next prime is 121623577. The reversal of 121623553 is 355326121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120384784 + 1238769 = 10972^2 + 1113^2 .

It is a cyclic number.

It is not a de Polignac number, because 121623553 - 2⁵ = 121623521 is a prime.

It is not a weakly prime, because it can be changed into another prime (121623053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60811776 + 60811777.

It is an arithmetic number, because the mean of its divisors is an integer number (60811777).

Almost surely, 2^121623553 is an apocalyptic number.

It is an amenable number.

121623553 is a deficient number, since it is larger than the sum of its proper divisors (1).

121623553 is an equidigital number, since it uses as much as digits as its factorization.

121623553 is an evil number, because the sum of its binary digits is even.

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

The square root of 121623553 is about 11028.3068963463. The cubic root of 121623553 is about 495.4569164741.

Adding to 121623553 its reverse (355326121), we get a palindrome (476949674).

The spelling of 121623553 in words is "one hundred twenty-one million, six hundred twenty-three thousand, five hundred fifty-three".