121375645 has 4 divisors (see below), whose sum is σ = 145650780. Its totient is φ = 97100512.

The previous prime is 121375603. The next prime is 121375697. The reversal of 121375645 is 546573121.

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 81974916 + 39400729 = 9054^2 + 6277^2 .

It is a cyclic number.

It is not a de Polignac number, because 121375645 - 2⁷ = 121375517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121375645.

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, 12137560 + ... + 12137569.

It is an arithmetic number, because the mean of its divisors is an integer number (36412695).

Almost surely, 2^121375645 is an apocalyptic number.

It is an amenable number.

121375645 is a deficient number, since it is larger than the sum of its proper divisors (24275135).

121375645 is an equidigital number, since it uses as much as digits as its factorization.

121375645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24275134.

The product of its digits is 25200, while the sum is 34.

The square root of 121375645 is about 11017.0615410825. The cubic root of 121375645 is about 495.1200538653.

The spelling of 121375645 in words is "one hundred twenty-one million, three hundred seventy-five thousand, six hundred forty-five".