121628579 has 2 divisors, whose sum is σ = 121628580. Its totient is φ = 121628578.

The previous prime is 121628569. The next prime is 121628641. The reversal of 121628579 is 975826121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121628579 is a prime.

It is a super-2 number, since 2×121628579² = 29587022459118482, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (121628539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60814289 + 60814290.

It is an arithmetic number, because the mean of its divisors is an integer number (60814290).

Almost surely, 2^121628579 is an apocalyptic number.

121628579 is a deficient number, since it is larger than the sum of its proper divisors (1).

121628579 is an equidigital number, since it uses as much as digits as its factorization.

121628579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 121628579 is about 11028.5347621522. The cubic root of 121628579 is about 495.4637411724.

The spelling of 121628579 in words is "one hundred twenty-one million, six hundred twenty-eight thousand, five hundred seventy-nine".