2148661 has 2 divisors, whose sum is σ = 2148662. Its totient is φ = 2148660.

The previous prime is 2148659. The next prime is 2148677. The reversal of 2148661 is 1668412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1168561 + 980100 = 1081^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 2148661 - 2¹ = 2148659 is a prime.

Together with 2148659, it forms a pair of twin primes.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2148631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1074330 + 1074331.

It is an arithmetic number, because the mean of its divisors is an integer number (1074331).

2^2148661 is an apocalyptic number.

It is an amenable number.

2148661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2148661 is an equidigital number, since it uses as much as digits as its factorization.

2148661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 28.

The square root of 2148661 is about 1465.8311635383. The cubic root of 2148661 is about 129.0394887420.

Subtracting from 2148661 its reverse (1668412), we obtain a square (480249 = 693²).

It can be divided in two parts, 2148 and 661, that added together give a square (2809 = 53²).

The spelling of 2148661 in words is "two million, one hundred forty-eight thousand, six hundred sixty-one".