121865801 has 4 divisors (see below), whose sum is σ = 126068100. Its totient is φ = 117663504.

The previous prime is 121865773. The next prime is 121865803. The reversal of 121865801 is 108568121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 108568121 = 4337 ⋅25033.

It can be written as a sum of positive squares in 2 ways, for example, as 94575625 + 27290176 = 9725^2 + 5224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121865801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121865803) 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, 2101106 + ... + 2101163.

It is an arithmetic number, because the mean of its divisors is an integer number (31517025).

Almost surely, 2^121865801 is an apocalyptic number.

It is an amenable number.

121865801 is a deficient number, since it is larger than the sum of its proper divisors (4202299).

121865801 is an equidigital number, since it uses as much as digits as its factorization.

121865801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202298.

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 121865801 is about 11039.2844423903. The cubic root of 121865801 is about 495.7856462451.

The spelling of 121865801 in words is "one hundred twenty-one million, eight hundred sixty-five thousand, eight hundred one".