1961165 has 4 divisors (see below), whose sum is σ = 2353404. Its totient is φ = 1568928.

The previous prime is 1961147. The next prime is 1961173. The reversal of 1961165 is 5611691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5611691 = 521 ⋅10771.

It can be written as a sum of positive squares in 2 ways, for example, as 1190281 + 770884 = 1091^2 + 878^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961165 - 2⁸ = 1960909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196112 + ... + 196121.

It is an arithmetic number, because the mean of its divisors is an integer number (588351).

2^1961165 is an apocalyptic number.

It is an amenable number.

1961165 is a deficient number, since it is larger than the sum of its proper divisors (392239).

1961165 is an equidigital number, since it uses as much as digits as its factorization.

1961165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392238.

The product of its digits is 1620, while the sum is 29.

The square root of 1961165 is about 1400.4160096200. The cubic root of 1961165 is about 125.1712851839.

The spelling of 1961165 in words is "one million, nine hundred sixty-one thousand, one hundred sixty-five".