2661397 has 2 divisors, whose sum is σ = 2661398. Its totient is φ = 2661396.

The previous prime is 2661391. The next prime is 2661403. The reversal of 2661397 is 7931662.

It is a balanced prime because it is at equal distance from previous prime (2661391) and next prime (2661403).

It can be written as a sum of positive squares in only one way, i.e., 2436721 + 224676 = 1561^2 + 474^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2661397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330698 + 1330699.

It is an arithmetic number, because the mean of its divisors is an integer number (1330699).

2^2661397 is an apocalyptic number.

It is an amenable number.

2661397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661397 is an equidigital number, since it uses as much as digits as its factorization.

2661397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 34.

The square root of 2661397 is about 1631.3788646418. The cubic root of 2661397 is about 138.5808500647.

The spelling of 2661397 in words is "two million, six hundred sixty-one thousand, three hundred ninety-seven".