1965281 has 4 divisors (see below), whose sum is σ = 2050752. Its totient is φ = 1879812.

The previous prime is 1965277. The next prime is 1965289. The reversal of 1965281 is 1825691.

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 a cyclic number.

It is not a de Polignac number, because 1965281 - 2² = 1965277 is a prime.

It is a super-2 number, since 2×1965281² = 7724658817922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1965289) 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, 42701 + ... + 42746.

It is an arithmetic number, because the mean of its divisors is an integer number (512688).

2^1965281 is an apocalyptic number.

It is an amenable number.

1965281 is a deficient number, since it is larger than the sum of its proper divisors (85471).

1965281 is an equidigital number, since it uses as much as digits as its factorization.

1965281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85470.

The product of its digits is 4320, while the sum is 32.

The square root of 1965281 is about 1401.8848026853. The cubic root of 1965281 is about 125.2587918445.

The spelling of 1965281 in words is "one million, nine hundred sixty-five thousand, two hundred eighty-one".