1812011265 has 12 divisors (see below), whose sum is σ = 3140819604. Its totient is φ = 966405984.

The previous prime is 1812011251. The next prime is 1812011269. The reversal of 1812011265 is 5621102181.

It can be written as a sum of positive squares in 2 ways, for example, as 771561729 + 1040449536 = 27777^2 + 32256^2 .

It is not a de Polignac number, because 1812011265 - 2⁷ = 1812011137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1812011269) 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, 20133414 + ... + 20133503.

It is an arithmetic number, because the mean of its divisors is an integer number (261734967).

Almost surely, 2^1812011265 is an apocalyptic number.

1812011265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1812011265 is a deficient number, since it is larger than the sum of its proper divisors (1328808339).

1812011265 is a wasteful number, since it uses less digits than its factorization.

1812011265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40266928 (or 40266925 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 1812011265 is about 42567.7256263475. The cubic root of 1812011265 is about 1219.1401414472.

The spelling of 1812011265 in words is "one billion, eight hundred twelve million, eleven thousand, two hundred sixty-five".