121739379 has 4 divisors (see below), whose sum is σ = 162319176. Its totient is φ = 81159584.

The previous prime is 121739341. The next prime is 121739383. The reversal of 121739379 is 973937121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 973937121 = 3 ⋅324645707.

It is a cyclic number.

It is not a de Polignac number, because 121739379 - 2⁹ = 121738867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121739379.

It is not an unprimeable number, because it can be changed into a prime (121739309) 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 3 ways as a sum of consecutive naturals, for example, 20289894 + ... + 20289899.

It is an arithmetic number, because the mean of its divisors is an integer number (40579794).

Almost surely, 2^121739379 is an apocalyptic number.

121739379 is a deficient number, since it is larger than the sum of its proper divisors (40579797).

121739379 is an equidigital number, since it uses as much as digits as its factorization.

121739379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40579796.

The product of its digits is 71442, while the sum is 42.

The square root of 121739379 is about 11033.5569514096. The cubic root of 121739379 is about 495.6141463964.

The spelling of 121739379 in words is "one hundred twenty-one million, seven hundred thirty-nine thousand, three hundred seventy-nine".