1065855091 has 4 divisors (see below), whose sum is σ = 1218120112. Its totient is φ = 913590072.

The previous prime is 1065855071. The next prime is 1065855097. The reversal of 1065855091 is 1905585601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1905585601 = 19 ⋅100293979.

It is a cyclic number.

It is not a de Polignac number, because 1065855091 - 2⁵ = 1065855059 is a prime.

It is a super-2 number, since 2×1065855091² = 2272094150021236562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1065855097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76132500 + ... + 76132513.

It is an arithmetic number, because the mean of its divisors is an integer number (304530028).

Almost surely, 2^1065855091 is an apocalyptic number.

1065855091 is a deficient number, since it is larger than the sum of its proper divisors (152265021).

1065855091 is an equidigital number, since it uses as much as digits as its factorization.

1065855091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152265020.

The product of its (nonzero) digits is 54000, while the sum is 40.

The square root of 1065855091 is about 32647.4362086826. The cubic root of 1065855091 is about 1021.4867115729.

The spelling of 1065855091 in words is "one billion, sixty-five million, eight hundred fifty-five thousand, ninety-one".