121860553 has 2 divisors, whose sum is σ = 121860554. Its totient is φ = 121860552.

The previous prime is 121860527. The next prime is 121860559. The reversal of 121860553 is 355068121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81054009 + 40806544 = 9003^2 + 6388^2 .

It is an emirp because it is prime and its reverse (355068121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121860553 - 2⁹ = 121860041 is a prime.

It is not a weakly prime, because it can be changed into another prime (121860559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60930276 + 60930277.

It is an arithmetic number, because the mean of its divisors is an integer number (60930277).

Almost surely, 2^121860553 is an apocalyptic number.

It is an amenable number.

121860553 is a deficient number, since it is larger than the sum of its proper divisors (1).

121860553 is an equidigital number, since it uses as much as digits as its factorization.

121860553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 121860553 is about 11039.0467432655. The cubic root of 121860553 is about 495.7785293444.

The spelling of 121860553 in words is "one hundred twenty-one million, eight hundred sixty thousand, five hundred fifty-three".