2011531345 has 4 divisors (see below), whose sum is σ = 2413837620. Its totient is φ = 1609225072.

The previous prime is 2011531339. The next prime is 2011531351. The reversal of 2011531345 is 5431351102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2011531339) and next prime (2011531351).

It can be written as a sum of positive squares in 2 ways, for example, as 1075905601 + 935625744 = 32801^2 + 30588^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011531345 - 2¹⁷ = 2011400273 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201153130 + ... + 201153139.

It is an arithmetic number, because the mean of its divisors is an integer number (603459405).

Almost surely, 2^2011531345 is an apocalyptic number.

It is an amenable number.

2011531345 is a deficient number, since it is larger than the sum of its proper divisors (402306275).

2011531345 is an equidigital number, since it uses as much as digits as its factorization.

2011531345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402306274.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2011531345 is about 44850.0986063576. The cubic root of 2011531345 is about 1262.3378417354.

Adding to 2011531345 its reverse (5431351102), we get a palindrome (7442882447).

The spelling of 2011531345 in words is "two billion, eleven million, five hundred thirty-one thousand, three hundred forty-five".