121757879 has 2 divisors, whose sum is σ = 121757880. Its totient is φ = 121757878.

The previous prime is 121757873. The next prime is 121757899. The reversal of 121757879 is 978757121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121757879 - 2¹⁶ = 121692343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121757873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60878939 + 60878940.

It is an arithmetic number, because the mean of its divisors is an integer number (60878940).

Almost surely, 2^121757879 is an apocalyptic number.

121757879 is a deficient number, since it is larger than the sum of its proper divisors (1).

121757879 is an equidigital number, since it uses as much as digits as its factorization.

121757879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246960, while the sum is 47.

The square root of 121757879 is about 11034.3952711510. The cubic root of 121757879 is about 495.6392502901.

The spelling of 121757879 in words is "one hundred twenty-one million, seven hundred fifty-seven thousand, eight hundred seventy-nine".