121656533 has 2 divisors, whose sum is σ = 121656534. Its totient is φ = 121656532.

The previous prime is 121656529. The next prime is 121656551. The reversal of 121656533 is 335656121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86527204 + 35129329 = 9302^2 + 5927^2 .

It is a cyclic number.

It is not a de Polignac number, because 121656533 - 2² = 121656529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121656533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121656133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60828266 + 60828267.

It is an arithmetic number, because the mean of its divisors is an integer number (60828267).

Almost surely, 2^121656533 is an apocalyptic number.

It is an amenable number.

121656533 is a deficient number, since it is larger than the sum of its proper divisors (1).

121656533 is an equidigital number, since it uses as much as digits as its factorization.

121656533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 32.

The square root of 121656533 is about 11029.8020381147. The cubic root of 121656533 is about 495.5016958828.

The spelling of 121656533 in words is "one hundred twenty-one million, six hundred fifty-six thousand, five hundred thirty-three".