2100649 has 2 divisors, whose sum is σ = 2100650. Its totient is φ = 2100648.

The previous prime is 2100629. The next prime is 2100661. The reversal of 2100649 is 9460012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1904400 + 196249 = 1380^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100649 - 2¹³ = 2092457 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050324 + 1050325.

It is an arithmetic number, because the mean of its divisors is an integer number (1050325).

2^2100649 is an apocalyptic number.

It is an amenable number.

2100649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100649 is an equidigital number, since it uses as much as digits as its factorization.

2100649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 2100649 is about 1449.3615835947. The cubic root of 2100649 is about 128.0711071381.

The spelling of 2100649 in words is "two million, one hundred thousand, six hundred forty-nine".