2112534661 has 4 divisors (see below), whose sum is σ = 2131229772. Its totient is φ = 2093839552.

The previous prime is 2112534643. The next prime is 2112534719. The reversal of 2112534661 is 1664352112.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 313502436 + 1799032225 = 17706^2 + 42415^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112534661 - 2⁷ = 2112534533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112534601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9347386 + ... + 9347611.

It is an arithmetic number, because the mean of its divisors is an integer number (532807443).

Almost surely, 2^2112534661 is an apocalyptic number.

It is an amenable number.

2112534661 is a deficient number, since it is larger than the sum of its proper divisors (18695111).

2112534661 is a wasteful number, since it uses less digits than its factorization.

2112534661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18695110.

The product of its digits is 8640, while the sum is 31.

The square root of 2112534661 is about 45962.3178375504. The cubic root of 2112534661 is about 1283.1219894995.

Adding to 2112534661 its reverse (1664352112), we get a palindrome (3776886773).

The spelling of 2112534661 in words is "two billion, one hundred twelve million, five hundred thirty-four thousand, six hundred sixty-one".