121109785 has 12 divisors (see below), whose sum is σ = 154385388. Its totient is φ = 91187456.

The previous prime is 121109783. The next prime is 121109809. The reversal of 121109785 is 587901121.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 26378496 + 94731289 = 5136^2 + 9733^2 .

It is not a de Polignac number, because 121109785 - 2¹ = 121109783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121109785.

It is not an unprimeable number, because it can be changed into a prime (121109783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40462 + ... + 43351.

It is an arithmetic number, because the mean of its divisors is an integer number (12865449).

Almost surely, 2^121109785 is an apocalyptic number.

It is an amenable number.

121109785 is a deficient number, since it is larger than the sum of its proper divisors (33275603).

121109785 is an equidigital number, since it uses as much as digits as its factorization.

121109785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83852 (or 83835 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 121109785 is about 11004.9890958601. The cubic root of 121109785 is about 494.7582875940.

The spelling of 121109785 in words is "one hundred twenty-one million, one hundred nine thousand, seven hundred eighty-five".