1961891 has 8 divisors (see below), whose sum is σ = 2032800. Its totient is φ = 1892160.

The previous prime is 1961887. The next prime is 1961893. The reversal of 1961891 is 1981691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1961891 - 2² = 1961887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4250 + ... + 4688.

It is an arithmetic number, because the mean of its divisors is an integer number (254100).

2^1961891 is an apocalyptic number.

1961891 is a deficient number, since it is larger than the sum of its proper divisors (70909).

1961891 is a wasteful number, since it uses less digits than its factorization.

1961891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589.

The product of its digits is 3888, while the sum is 35.

The square root of 1961891 is about 1400.6751943259. The cubic root of 1961891 is about 125.1867289196.

The spelling of 1961891 in words is "one million, nine hundred sixty-one thousand, eight hundred ninety-one".