2113145531 has 6 divisors (see below), whose sum is σ = 2458148940. Its totient is φ = 1811267556.

The previous prime is 2113145513. The next prime is 2113145537. The reversal of 2113145531 is 1355413112.

It is not a de Polignac number, because 2113145531 - 2⁶ = 2113145467 is a prime.

It is a super-2 number, since 2×2113145531² = 8930768070370543922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2113145531.

It is not an unprimeable number, because it can be changed into a prime (2113145537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21562661 + ... + 21562758.

It is an arithmetic number, because the mean of its divisors is an integer number (409691490).

Almost surely, 2^2113145531 is an apocalyptic number.

2113145531 is a deficient number, since it is larger than the sum of its proper divisors (345003409).

2113145531 is an equidigital number, since it uses as much as digits as its factorization.

2113145531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43125433 (or 43125426 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The square root of 2113145531 is about 45968.9626922340. The cubic root of 2113145531 is about 1283.2456553506.

Adding to 2113145531 its reverse (1355413112), we get a palindrome (3468558643).

The spelling of 2113145531 in words is "two billion, one hundred thirteen million, one hundred forty-five thousand, five hundred thirty-one".