121651679 has 2 divisors, whose sum is σ = 121651680. Its totient is φ = 121651678.

The previous prime is 121651667. The next prime is 121651759. The reversal of 121651679 is 976156121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121651679 - 2¹² = 121647583 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121651379) 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 as a sum of consecutive naturals, namely, 60825839 + 60825840.

It is an arithmetic number, because the mean of its divisors is an integer number (60825840).

Almost surely, 2^121651679 is an apocalyptic number.

121651679 is a deficient number, since it is larger than the sum of its proper divisors (1).

121651679 is an equidigital number, since it uses as much as digits as its factorization.

121651679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 121651679 is about 11029.5819957059. The cubic root of 121651679 is about 495.4951057525.

The spelling of 121651679 in words is "one hundred twenty-one million, six hundred fifty-one thousand, six hundred seventy-nine".