121696389 has 12 divisors (see below), whose sum is σ = 175890156. Its totient is φ = 81081792.

The previous prime is 121696369. The next prime is 121696411. The reversal of 121696389 is 983696121.

It is a happy number.

121696389 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 9 + 638 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 77739489 + 43956900 = 8817^2 + 6630^2 .

It is not a de Polignac number, because 121696389 - 2⁵ = 121696357 is a prime.

It is a super-2 number, since 2×121696389² = 29620022191278642, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121696339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17689 + ... + 23585.

It is an arithmetic number, because the mean of its divisors is an integer number (14657513).

Almost surely, 2^121696389 is an apocalyptic number.

121696389 is the 5897-th nonagonal number.

It is an amenable number.

121696389 is a deficient number, since it is larger than the sum of its proper divisors (54193767).

121696389 is a wasteful number, since it uses less digits than its factorization.

121696389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8196 (or 8193 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 121696389 is about 11031.6086315641. The cubic root of 121696389 is about 495.5558005518. Note that the first 3 decimals are identical.

The spelling of 121696389 in words is "one hundred twenty-one million, six hundred ninety-six thousand, three hundred eighty-nine".