121553533 has 2 divisors, whose sum is σ = 121553534. Its totient is φ = 121553532.

The previous prime is 121553521. The next prime is 121553557. The reversal of 121553533 is 335355121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120956004 + 597529 = 10998^2 + 773^2 .

It is a cyclic number.

It is not a de Polignac number, because 121553533 - 2²⁵ = 87999101 is a prime.

It is a super-2 number, since 2×121553533² = 29550522769564178, which contains 22 as substring.

It is equal to p_6925024 and since 121553533 and 6925024 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121553563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60776766 + 60776767.

It is an arithmetic number, because the mean of its divisors is an integer number (60776767).

Almost surely, 2^121553533 is an apocalyptic number.

It is an amenable number.

121553533 is a deficient number, since it is larger than the sum of its proper divisors (1).

121553533 is an equidigital number, since it uses as much as digits as its factorization.

121553533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6750, while the sum is 28.

The square root of 121553533 is about 11025.1318812974. The cubic root of 121553533 is about 495.3618182466.

The spelling of 121553533 in words is "one hundred twenty-one million, five hundred fifty-three thousand, five hundred thirty-three".