2511561938 has 6 divisors (see below), whose sum is σ = 3767449221. Its totient is φ = 1255745532.

The previous prime is 2511561919. The next prime is 2511561947. The reversal of 2511561938 is 8391651152.

2511561938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1984078849 + 527483089 = 44543^2 + 22967^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=35437.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2511561895 and 2511561904.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 53156 + ... + 88592.

Almost surely, 2^2511561938 is an apocalyptic number.

2511561938 is a deficient number, since it is larger than the sum of its proper divisors (1255887283).

2511561938 is an frugal number, since it uses more digits than its factorization.

2511561938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70876 (or 35439 counting only the distinct ones).

The product of its digits is 64800, while the sum is 41.

The square root of 2511561938 is about 50115.4860098154. The cubic root of 2511561938 is about 1359.2978530248.

Multiplying 2511561938 by its product of digits (64800), we get a square (162749213582400 = 12757320²).

The spelling of 2511561938 in words is "two billion, five hundred eleven million, five hundred sixty-one thousand, nine hundred thirty-eight".