121773857 has 2 divisors, whose sum is σ = 121773858. Its totient is φ = 121773856.

The previous prime is 121773853. The next prime is 121773881. The reversal of 121773857 is 758377121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73942801 + 47831056 = 8599^2 + 6916^2 .

It is an emirp because it is prime and its reverse (758377121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121773857 - 2² = 121773853 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121773853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60886928 + 60886929.

It is an arithmetic number, because the mean of its divisors is an integer number (60886929).

Almost surely, 2^121773857 is an apocalyptic number.

It is an amenable number.

121773857 is a deficient number, since it is larger than the sum of its proper divisors (1).

121773857 is an equidigital number, since it uses as much as digits as its factorization.

121773857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82320, while the sum is 41.

The square root of 121773857 is about 11035.1192562654. The cubic root of 121773857 is about 495.6609298660.

The spelling of 121773857 in words is "one hundred twenty-one million, seven hundred seventy-three thousand, eight hundred fifty-seven".