121309879 has 2 divisors, whose sum is σ = 121309880. Its totient is φ = 121309878.

The previous prime is 121309873. The next prime is 121309883. The reversal of 121309879 is 978903121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121309879 - 2⁹ = 121309367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121309873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60654939 + 60654940.

It is an arithmetic number, because the mean of its divisors is an integer number (60654940).

Almost surely, 2^121309879 is an apocalyptic number.

121309879 is a deficient number, since it is larger than the sum of its proper divisors (1).

121309879 is an equidigital number, since it uses as much as digits as its factorization.

121309879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 121309879 is about 11014.0764024951. The cubic root of 121309879 is about 495.0306126699.

The spelling of 121309879 in words is "one hundred twenty-one million, three hundred nine thousand, eight hundred seventy-nine".