123987553 has 2 divisors, whose sum is σ = 123987554. Its totient is φ = 123987552.

The previous prime is 123987529. The next prime is 123987571. The reversal of 123987553 is 355789321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112105744 + 11881809 = 10588^2 + 3447^2 .

It is a cyclic number.

It is not a de Polignac number, because 123987553 - 2⁹ = 123987041 is a prime.

It is not a weakly prime, because it can be changed into another prime (123982553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61993776 + 61993777.

It is an arithmetic number, because the mean of its divisors is an integer number (61993777).

Almost surely, 2^123987553 is an apocalyptic number.

It is an amenable number.

123987553 is a deficient number, since it is larger than the sum of its proper divisors (1).

123987553 is an equidigital number, since it uses as much as digits as its factorization.

123987553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 43.

The square root of 123987553 is about 11134.9698248356. The cubic root of 123987553 is about 498.6464095592.

The spelling of 123987553 in words is "one hundred twenty-three million, nine hundred eighty-seven thousand, five hundred fifty-three".