121145917 has 4 divisors (see below), whose sum is σ = 121188700. Its totient is φ = 121103136.

The previous prime is 121145897. The next prime is 121145929. The reversal of 121145917 is 719541121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66814276 + 54331641 = 8174^2 + 7371^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121145917 is a prime.

It is a super-3 number, since 3×121145917³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121145987) 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, 16818 + ... + 22915.

It is an arithmetic number, because the mean of its divisors is an integer number (30297175).

Almost surely, 2^121145917 is an apocalyptic number.

It is an amenable number.

121145917 is a deficient number, since it is larger than the sum of its proper divisors (42783).

121145917 is an equidigital number, since it uses as much as digits as its factorization.

121145917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42782.

The product of its digits is 2520, while the sum is 31.

The square root of 121145917 is about 11006.6305925110. The cubic root of 121145917 is about 494.8074849097.

The spelling of 121145917 in words is "one hundred twenty-one million, one hundred forty-five thousand, nine hundred seventeen".