1601261 has 2 divisors, whose sum is σ = 1601262. Its totient is φ = 1601260.

The previous prime is 1601239. The next prime is 1601267. The reversal of 1601261 is 1621061.

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., 1357225 + 244036 = 1165^2 + 494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1601261 is a prime.

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 (1601267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800630 + 800631.

It is an arithmetic number, because the mean of its divisors is an integer number (800631).

2^1601261 is an apocalyptic number.

It is an amenable number.

1601261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601261 is an equidigital number, since it uses as much as digits as its factorization.

1601261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1601261 is about 1265.4094199112. The cubic root of 1601261 is about 116.9914280130.

The spelling of 1601261 in words is "one million, six hundred one thousand, two hundred sixty-one".