121777165 has 8 divisors (see below), whose sum is σ = 146233080. Its totient is φ = 97354752.

The previous prime is 121777151. The next prime is 121777169. The reversal of 121777165 is 561777121.

It can be written as a sum of positive squares in 4 ways, for example, as 49646116 + 72131049 = 7046^2 + 8493^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121777165 - 2⁷ = 121777037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121777169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 477 + ... + 15613.

It is an arithmetic number, because the mean of its divisors is an integer number (18279135).

Almost surely, 2^121777165 is an apocalyptic number.

It is an amenable number.

121777165 is a deficient number, since it is larger than the sum of its proper divisors (24455915).

121777165 is a wasteful number, since it uses less digits than its factorization.

121777165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16751.

The product of its digits is 20580, while the sum is 37.

The square root of 121777165 is about 11035.2691403518. The cubic root of 121777165 is about 495.6654180530.

The spelling of 121777165 in words is "one hundred twenty-one million, seven hundred seventy-seven thousand, one hundred sixty-five".