121099645 has 4 divisors (see below), whose sum is σ = 145319580. Its totient is φ = 96879712.

The previous prime is 121099639. The next prime is 121099651. The reversal of 121099645 is 546990121.

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

It is an interprime number because it is at equal distance from previous prime (121099639) and next prime (121099651).

It can be written as a sum of positive squares in 2 ways, for example, as 47637604 + 73462041 = 6902^2 + 8571^2 .

It is a cyclic number.

It is not a de Polignac number, because 121099645 - 2⁵ = 121099613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12109960 + ... + 12109969.

It is an arithmetic number, because the mean of its divisors is an integer number (36329895).

Almost surely, 2^121099645 is an apocalyptic number.

It is an amenable number.

121099645 is a deficient number, since it is larger than the sum of its proper divisors (24219935).

121099645 is an equidigital number, since it uses as much as digits as its factorization.

121099645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24219934.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 121099645 is about 11004.5283860782. The cubic root of 121099645 is about 494.7444792161.

The spelling of 121099645 in words is "one hundred twenty-one million, ninety-nine thousand, six hundred forty-five".