877660121 has 4 divisors (see below), whose sum is σ = 945172452. Its totient is φ = 810147792.

The previous prime is 877660109. The next prime is 877660123. The reversal of 877660121 is 121066778.

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 86025625 + 791634496 = 9275^2 + 28136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-877660121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (877660123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33756146 + ... + 33756171.

It is an arithmetic number, because the mean of its divisors is an integer number (236293113).

Almost surely, 2^877660121 is an apocalyptic number.

It is an amenable number.

877660121 is a deficient number, since it is larger than the sum of its proper divisors (67512331).

877660121 is a wasteful number, since it uses less digits than its factorization.

877660121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67512330.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 877660121 is about 29625.3290445862. The cubic root of 877660121 is about 957.4338733655.

The spelling of 877660121 in words is "eight hundred seventy-seven million, six hundred sixty thousand, one hundred twenty-one".