121579739 has 2 divisors, whose sum is σ = 121579740. Its totient is φ = 121579738.

The previous prime is 121579693. The next prime is 121579747. The reversal of 121579739 is 937975121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121579739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121579739.

It is not a weakly prime, because it can be changed into another prime (121579639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60789869 + 60789870.

It is an arithmetic number, because the mean of its divisors is an integer number (60789870).

Almost surely, 2^121579739 is an apocalyptic number.

121579739 is a deficient number, since it is larger than the sum of its proper divisors (1).

121579739 is an equidigital number, since it uses as much as digits as its factorization.

121579739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 119070, while the sum is 44.

The square root of 121579739 is about 11026.3202837574. The cubic root of 121579739 is about 495.3974144121.

It can be divided in two parts, 12 and 1579739, that added together give a palindrome (1579751).

The spelling of 121579739 in words is "one hundred twenty-one million, five hundred seventy-nine thousand, seven hundred thirty-nine".