1610561 has 2 divisors, whose sum is σ = 1610562. Its totient is φ = 1610560.

The previous prime is 1610551. The next prime is 1610569. The reversal of 1610561 is 1650161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1062961 + 547600 = 1031^2 + 740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1610561 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1610569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805280 + 805281.

It is an arithmetic number, because the mean of its divisors is an integer number (805281).

2^1610561 is an apocalyptic number.

It is an amenable number.

1610561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1610561 is an equidigital number, since it uses as much as digits as its factorization.

1610561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1610561 is about 1269.0787997599. The cubic root of 1610561 is about 117.2174833264.

The spelling of 1610561 in words is "one million, six hundred ten thousand, five hundred sixty-one".