1965261 has 4 divisors (see below), whose sum is σ = 2620352. Its totient is φ = 1310172.

The previous prime is 1965259. The next prime is 1965263. The reversal of 1965261 is 1625691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1965259) and next prime (1965263).

It is not a de Polignac number, because 1965261 - 2¹ = 1965259 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1965263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327541 + ... + 327546.

It is an arithmetic number, because the mean of its divisors is an integer number (655088).

2^1965261 is an apocalyptic number.

It is an amenable number.

1965261 is a deficient number, since it is larger than the sum of its proper divisors (655091).

1965261 is an equidigital number, since it uses as much as digits as its factorization.

1965261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655090.

The product of its digits is 3240, while the sum is 30.

The square root of 1965261 is about 1401.8776694134. The cubic root of 1965261 is about 125.2583669376.

The spelling of 1965261 in words is "one million, nine hundred sixty-five thousand, two hundred sixty-one".