121665741 has 16 divisors (see below), whose sum is σ = 164462400. Its totient is φ = 79996928.

The previous prime is 121665703. The next prime is 121665743. The reversal of 121665741 is 147566121.

It is a cyclic number.

It is not a de Polignac number, because 121665741 - 2²⁶ = 54556877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121665743) 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, 85645 + ... + 87053.

It is an arithmetic number, because the mean of its divisors is an integer number (10278900).

Almost surely, 2^121665741 is an apocalyptic number.

It is an amenable number.

121665741 is a deficient number, since it is larger than the sum of its proper divisors (42796659).

121665741 is a wasteful number, since it uses less digits than its factorization.

121665741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788.

The product of its digits is 10080, while the sum is 33.

The square root of 121665741 is about 11030.2194447799. The cubic root of 121665741 is about 495.5141968268.

The spelling of 121665741 in words is "one hundred twenty-one million, six hundred sixty-five thousand, seven hundred forty-one".