121692561 has 8 divisors (see below), whose sum is σ = 163331904. Its totient is φ = 80590800.

The previous prime is 121692559. The next prime is 121692583. The reversal of 121692561 is 165296121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121692561 - 2¹ = 121692559 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (121692521) 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 7 ways as a sum of consecutive naturals, for example, 133866 + ... + 134771.

It is an arithmetic number, because the mean of its divisors is an integer number (20416488).

Almost surely, 2^121692561 is an apocalyptic number.

It is an amenable number.

121692561 is a deficient number, since it is larger than the sum of its proper divisors (41639343).

121692561 is a wasteful number, since it uses less digits than its factorization.

121692561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268791.

The product of its digits is 6480, while the sum is 33.

The square root of 121692561 is about 11031.4351287582. The cubic root of 121692561 is about 495.5506045404.

The spelling of 121692561 in words is "one hundred twenty-one million, six hundred ninety-two thousand, five hundred sixty-one".