1087780121 has 4 divisors (see below), whose sum is σ = 1105612644. Its totient is φ = 1069947600.

The previous prime is 1087780117. The next prime is 1087780123. The reversal of 1087780121 is 1210877801.

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 440790025 + 646990096 = 20995^2 + 25436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1087780121 - 2² = 1087780117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1087780123) 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, 8916170 + ... + 8916291.

It is an arithmetic number, because the mean of its divisors is an integer number (276403161).

Almost surely, 2^1087780121 is an apocalyptic number.

It is an amenable number.

1087780121 is a deficient number, since it is larger than the sum of its proper divisors (17832523).

1087780121 is an equidigital number, since it uses as much as digits as its factorization.

1087780121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17832522.

The product of its (nonzero) digits is 6272, while the sum is 35.

The square root of 1087780121 is about 32981.5118058587. The cubic root of 1087780121 is about 1028.4433459550.

The spelling of 1087780121 in words is "one billion, eighty-seven million, seven hundred eighty thousand, one hundred twenty-one".