1965121 has 4 divisors (see below), whose sum is σ = 2028544. Its totient is φ = 1901700.

The previous prime is 1965109. The next prime is 1965133. The reversal of 1965121 is 1215691.

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 (1965109) and next prime (1965133).

It is a cyclic number.

It is not a de Polignac number, because 1965121 - 2¹⁵ = 1932353 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1965521) 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, 31665 + ... + 31726.

It is an arithmetic number, because the mean of its divisors is an integer number (507136).

2^1965121 is an apocalyptic number.

It is an amenable number.

1965121 is a deficient number, since it is larger than the sum of its proper divisors (63423).

1965121 is an equidigital number, since it uses as much as digits as its factorization.

1965121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63422.

The product of its digits is 540, while the sum is 25.

The square root of 1965121 is about 1401.8277354939. The cubic root of 1965121 is about 125.2553925086.

The spelling of 1965121 in words is "one million, nine hundred sixty-five thousand, one hundred twenty-one".