2661943 has 2 divisors, whose sum is σ = 2661944. Its totient is φ = 2661942.

The previous prime is 2661937. The next prime is 2661947. The reversal of 2661943 is 3491662.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2661943 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330971 + 1330972.

It is an arithmetic number, because the mean of its divisors is an integer number (1330972).

2^2661943 is an apocalyptic number.

2661943 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661943 is an equidigital number, since it uses as much as digits as its factorization.

2661943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

The square root of 2661943 is about 1631.5461991620. The cubic root of 2661943 is about 138.5903262872.

It can be divided in two parts, 26619 and 43, that added together give a palindrome (26662).

The spelling of 2661943 in words is "two million, six hundred sixty-one thousand, nine hundred forty-three".