121656445 has 16 divisors (see below), whose sum is σ = 151004160. Its totient is φ = 94034304.

The previous prime is 121656443. The next prime is 121656467. The reversal of 121656445 is 544656121.

It is a cyclic number.

It is not a de Polignac number, because 121656445 - 2¹ = 121656443 is a prime.

It is a super-2 number, since 2×121656445² = 29600581220076050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121656445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121656443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15289 + ... + 21841.

It is an arithmetic number, because the mean of its divisors is an integer number (9437760).

Almost surely, 2^121656445 is an apocalyptic number.

It is an amenable number.

121656445 is a deficient number, since it is larger than the sum of its proper divisors (29347715).

121656445 is an equidigital number, since it uses as much as digits as its factorization.

121656445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6684.

The product of its digits is 28800, while the sum is 34.

The square root of 121656445 is about 11029.7980489218. The cubic root of 121656445 is about 495.5015764094.

It can be divided in two parts, 1216564 and 45, that added together give a square (1216609 = 1103²).

The spelling of 121656445 in words is "one hundred twenty-one million, six hundred fifty-six thousand, four hundred forty-five".