1065855121 has 12 divisors (see below), whose sum is σ = 1125299700. Its totient is φ = 1009368800.

The previous prime is 1065855097. The next prime is 1065855149. The reversal of 1065855121 is 1215585601.

It can be written as a sum of positive squares in 2 ways, for example, as 603390096 + 462465025 = 24564^2 + 21505^2 .

It is not a de Polignac number, because 1065855121 - 2¹⁵ = 1065822353 is a prime.

It is a super-2 number, since 2×1065855121² = 2272094277923849282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1065855151) 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, 43455 + ... + 63403.

It is an arithmetic number, because the mean of its divisors is an integer number (93774975).

Almost surely, 2^1065855121 is an apocalyptic number.

It is an amenable number.

1065855121 is a deficient number, since it is larger than the sum of its proper divisors (59444579).

1065855121 is a wasteful number, since it uses less digits than its factorization.

1065855121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20096 (or 20073 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 34.

The square root of 1065855121 is about 32647.4366681367. The cubic root of 1065855121 is about 1021.4867211566.

The spelling of 1065855121 in words is "one billion, sixty-five million, eight hundred fifty-five thousand, one hundred twenty-one".