2039561 has 2 divisors, whose sum is σ = 2039562. Its totient is φ = 2039560.

The previous prime is 2039549. The next prime is 2039567. The reversal of 2039561 is 1659302.

2039561 is an esthetic number in base 13, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1974025 + 65536 = 1405^2 + 256^2 .

It is a cyclic number.

It is not a de Polignac number, because 2039561 - 2¹⁰ = 2038537 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2039561.

It is not a weakly prime, because it can be changed into another prime (2039567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1019780 + 1019781.

It is an arithmetic number, because the mean of its divisors is an integer number (1019781).

2^2039561 is an apocalyptic number.

It is an amenable number.

2039561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2039561 is an equidigital number, since it uses as much as digits as its factorization.

2039561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 2039561 is about 1428.1319967006. The cubic root of 2039561 is about 126.8174159322.

The spelling of 2039561 in words is "two million, thirty-nine thousand, five hundred sixty-one".