2661331 has 2 divisors, whose sum is σ = 2661332. Its totient is φ = 2661330.

The previous prime is 2661317. The next prime is 2661341. The reversal of 2661331 is 1331662.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2661331 is a prime.

It is a super-2 number, since 2×2661331² = 14165365383122, which contains 22 as substring.

It is equal to p₁₉₄₀₃₅ and since 2661331 and 194035 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (2661341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330665 + 1330666.

It is an arithmetic number, because the mean of its divisors is an integer number (1330666).

2^2661331 is an apocalyptic number.

2661331 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661331 is an equidigital number, since it uses as much as digits as its factorization.

2661331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 22.

The square root of 2661331 is about 1631.3586362293. The cubic root of 2661331 is about 138.5797044994.

Adding to 2661331 its reverse (1331662), we get a palindrome (3992993).

It can be divided in two parts, 2661 and 331, that added together give a palindrome (2992).

The spelling of 2661331 in words is "two million, six hundred sixty-one thousand, three hundred thirty-one".