1609261 has 2 divisors, whose sum is σ = 1609262. Its totient is φ = 1609260.

The previous prime is 1609249. The next prime is 1609301. The reversal of 1609261 is 1629061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1464100 + 145161 = 1210^2 + 381^2 .

It is a cyclic number.

It is not a de Polignac number, because 1609261 - 2¹⁵ = 1576493 is a prime.

It is a super-2 number, since 2×1609261² = 5179441932242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1609211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804630 + 804631.

It is an arithmetic number, because the mean of its divisors is an integer number (804631).

2^1609261 is an apocalyptic number.

It is an amenable number.

1609261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1609261 is an equidigital number, since it uses as much as digits as its factorization.

1609261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1609261 is about 1268.5665138257. The cubic root of 1609261 is about 117.1859366073.

The spelling of 1609261 in words is "one million, six hundred nine thousand, two hundred sixty-one".