121609943 has 16 divisors (see below), whose sum is σ = 150217536. Its totient is φ = 95869440.

The previous prime is 121609927. The next prime is 121609949. The reversal of 121609943 is 349906121.

It is a cyclic number.

It is not a de Polignac number, because 121609943 - 2⁴ = 121609927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121609949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24383 + ... + 28943.

It is an arithmetic number, because the mean of its divisors is an integer number (9388596).

Almost surely, 2^121609943 is an apocalyptic number.

121609943 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121609943 is a deficient number, since it is larger than the sum of its proper divisors (28607593).

121609943 is a wasteful number, since it uses less digits than its factorization.

121609943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4874.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 121609943 is about 11027.6898306037. The cubic root of 121609943 is about 495.4384348012.

The spelling of 121609943 in words is "one hundred twenty-one million, six hundred nine thousand, nine hundred forty-three".