2497661 has 2 divisors, whose sum is σ = 2497662. Its totient is φ = 2497660.

The previous prime is 2497637. The next prime is 2497667. The reversal of 2497661 is 1667942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2464900 + 32761 = 1570^2 + 181^2 .

It is a cyclic number.

It is not a de Polignac number, because 2497661 - 2¹⁴ = 2481277 is a prime.

It is a super-3 number, since 3×2497661³ = 46743554307333047343, which contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2497667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1248830 + 1248831.

It is an arithmetic number, because the mean of its divisors is an integer number (1248831).

2^2497661 is an apocalyptic number.

It is an amenable number.

2497661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2497661 is an equidigital number, since it uses as much as digits as its factorization.

2497661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 2497661 is about 1580.3990002528. The cubic root of 2497661 is about 135.6785408039.

The spelling of 2497661 in words is "two million, four hundred ninety-seven thousand, six hundred sixty-one".