121225645 has 4 divisors (see below), whose sum is σ = 145470780. Its totient is φ = 96980512.

The previous prime is 121225639. The next prime is 121225661. The reversal of 121225645 is 546522121.

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 13003236 + 108222409 = 3606^2 + 10403^2 .

It is a cyclic number.

It is not a de Polignac number, because 121225645 - 2²³ = 112837037 is a prime.

It is a super-3 number, since 3×121225645³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12122560 + ... + 12122569.

It is an arithmetic number, because the mean of its divisors is an integer number (36367695).

Almost surely, 2^121225645 is an apocalyptic number.

It is an amenable number.

121225645 is a deficient number, since it is larger than the sum of its proper divisors (24245135).

121225645 is an equidigital number, since it uses as much as digits as its factorization.

121225645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24245134.

The product of its digits is 4800, while the sum is 28.

The square root of 121225645 is about 11010.2518136508. The cubic root of 121225645 is about 494.9160079236.

Adding to 121225645 its reverse (546522121), we get a palindrome (667747766).

The spelling of 121225645 in words is "one hundred twenty-one million, two hundred twenty-five thousand, six hundred forty-five".