121195139 has 12 divisors (see below), whose sum is σ = 134443512. Its totient is φ = 109137600.

The previous prime is 121195121. The next prime is 121195141. The reversal of 121195139 is 931591121.

It is not a de Polignac number, because 121195139 - 2⁸ = 121194883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121195339) 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 11 ways as a sum of consecutive naturals, for example, 1817 + ... + 15674.

It is an arithmetic number, because the mean of its divisors is an integer number (11203626).

Almost surely, 2^121195139 is an apocalyptic number.

121195139 is a deficient number, since it is larger than the sum of its proper divisors (13248373).

121195139 is a wasteful number, since it uses less digits than its factorization.

121195139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17558 (or 17545 counting only the distinct ones).

The product of its digits is 2430, while the sum is 32.

The square root of 121195139 is about 11008.8663812402. The cubic root of 121195139 is about 494.8744898263.

The spelling of 121195139 in words is "one hundred twenty-one million, one hundred ninety-five thousand, one hundred thirty-nine".