121795857 has 18 divisors (see below), whose sum is σ = 177418566. Its totient is φ = 80513280.

The previous prime is 121795813. The next prime is 121795867. The reversal of 121795857 is 758597121.

It can be written as a sum of positive squares in 3 ways, for example, as 27783441 + 94012416 = 5271^2 + 9696^2 .

It is not a de Polignac number, because 121795857 - 2¹⁹ = 121271569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121795867) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 505257 + ... + 505497.

It is an arithmetic number, because the mean of its divisors is an integer number (9856587).

Almost surely, 2^121795857 is an apocalyptic number.

It is an amenable number.

121795857 is a deficient number, since it is larger than the sum of its proper divisors (55622709).

121795857 is an equidigital number, since it uses as much as digits as its factorization.

121795857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 477 counting only the distinct ones).

The product of its digits is 176400, while the sum is 45.

The square root of 121795857 is about 11036.1160287485. The cubic root of 121795857 is about 495.6907772244.

The spelling of 121795857 in words is "one hundred twenty-one million, seven hundred ninety-five thousand, eight hundred fifty-seven".