121319857 has 2 divisors, whose sum is σ = 121319858. Its totient is φ = 121319856.

The previous prime is 121319843. The next prime is 121319897. The reversal of 121319857 is 758913121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109181601 + 12138256 = 10449^2 + 3484^2 .

It is an emirp because it is prime and its reverse (758913121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121319857 - 2¹¹ = 121317809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121319827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60659928 + 60659929.

It is an arithmetic number, because the mean of its divisors is an integer number (60659929).

Almost surely, 2^121319857 is an apocalyptic number.

It is an amenable number.

121319857 is a deficient number, since it is larger than the sum of its proper divisors (1).

121319857 is an equidigital number, since it uses as much as digits as its factorization.

121319857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 37.

The square root of 121319857 is about 11014.5293589876. The cubic root of 121319857 is about 495.0441847441.

The spelling of 121319857 in words is "one hundred twenty-one million, three hundred nineteen thousand, eight hundred fifty-seven".