121945897 has 4 divisors (see below), whose sum is σ = 121969876. Its totient is φ = 121921920.

The previous prime is 121945883. The next prime is 121945919. The reversal of 121945897 is 798549121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798549121 = 23 ⋅34719527.

It can be written as a sum of positive squares in 2 ways, for example, as 58201641 + 63744256 = 7629^2 + 7984^2 .

It is a cyclic number.

It is not a de Polignac number, because 121945897 - 2²³ = 113557289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121945297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1008 + ... + 15649.

It is an arithmetic number, because the mean of its divisors is an integer number (30492469).

Almost surely, 2^121945897 is an apocalyptic number.

It is an amenable number.

121945897 is a deficient number, since it is larger than the sum of its proper divisors (23979).

121945897 is an equidigital number, since it uses as much as digits as its factorization.

121945897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23978.

The product of its digits is 181440, while the sum is 46.

The square root of 121945897 is about 11042.9116178660. The cubic root of 121945897 is about 495.8942404258.

The spelling of 121945897 in words is "one hundred twenty-one million, nine hundred forty-five thousand, eight hundred ninety-seven".