121766139 has 16 divisors (see below), whose sum is σ = 196794240. Its totient is φ = 73797480.

The previous prime is 121766101. The next prime is 121766159. The reversal of 121766139 is 931667121.

It is not a de Polignac number, because 121766139 - 2⁹ = 121765627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121766159) 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, 204697 + ... + 205290.

It is an arithmetic number, because the mean of its divisors is an integer number (12299640).

Almost surely, 2^121766139 is an apocalyptic number.

121766139 is a deficient number, since it is larger than the sum of its proper divisors (75028101).

121766139 is a wasteful number, since it uses less digits than its factorization.

121766139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410007 (or 410001 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 121766139 is about 11034.7695490209. The cubic root of 121766139 is about 495.6504580183.

The spelling of 121766139 in words is "one hundred twenty-one million, seven hundred sixty-six thousand, one hundred thirty-nine".