2011345531 has 16 divisors (see below), whose sum is σ = 2303640864. Its totient is φ = 1739672064.

The previous prime is 2011345517. The next prime is 2011345543. The reversal of 2011345531 is 1355431102.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-2011345531 is a prime.

It is a super-2 number, since 2×2011345531² = 8091021690147343922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011345496 and 2011345505.

It is not an unprimeable number, because it can be changed into a prime (2011345571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30121 + ... + 70213.

It is an arithmetic number, because the mean of its divisors is an integer number (143977554).

Almost surely, 2^2011345531 is an apocalyptic number.

2011345531 is a deficient number, since it is larger than the sum of its proper divisors (292295333).

2011345531 is a wasteful number, since it uses less digits than its factorization.

2011345531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40350.

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

The square root of 2011345531 is about 44848.0270580546. The cubic root of 2011345531 is about 1262.2989713052.

Adding to 2011345531 its reverse (1355431102), we get a palindrome (3366776633).

The spelling of 2011345531 in words is "two billion, eleven million, three hundred forty-five thousand, five hundred thirty-one".