2131042661 has 4 divisors (see below), whose sum is σ = 2324773824. Its totient is φ = 1937311500.

The previous prime is 2131042561. The next prime is 2131042681. The reversal of 2131042661 is 1662401312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2131042661 - 2²⁶ = 2063933797 is a prime.

It is a super-3 number, since 3×2131042661³ (a number of 29 digits) contains 333 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 2131042661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131042681) 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, 96865565 + ... + 96865586.

It is an arithmetic number, because the mean of its divisors is an integer number (581193456).

Almost surely, 2^2131042661 is an apocalyptic number.

It is an amenable number.

2131042661 is a deficient number, since it is larger than the sum of its proper divisors (193731163).

2131042661 is a wasteful number, since it uses less digits than its factorization.

2131042661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193731162.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2131042661 is about 46163.2176196591. The cubic root of 2131042661 is about 1286.8582603343.

Adding to 2131042661 its reverse (1662401312), we get a palindrome (3793443973).

The spelling of 2131042661 in words is "two billion, one hundred thirty-one million, forty-two thousand, six hundred sixty-one".