121577777 has 8 divisors (see below), whose sum is σ = 123434664. Its totient is φ = 119726208.

The previous prime is 121577759. The next prime is 121577783. The reversal of 121577777 is 777775121.

It can be written as a sum of positive squares in 4 ways, for example, as 25361296 + 96216481 = 5036^2 + 9809^2 .

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 121577777 - 2¹⁴ = 121561393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121577737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87863 + ... + 89235.

It is an arithmetic number, because the mean of its divisors is an integer number (15429333).

Almost surely, 2^121577777 is an apocalyptic number.

It is an amenable number.

121577777 is a deficient number, since it is larger than the sum of its proper divisors (1856887).

121577777 is a wasteful number, since it uses less digits than its factorization.

121577777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2659.

The product of its digits is 168070, while the sum is 44.

The square root of 121577777 is about 11026.2313144610. The cubic root of 121577777 is about 495.3947495631.

The spelling of 121577777 in words is "one hundred twenty-one million, five hundred seventy-seven thousand, seven hundred seventy-seven".