1961191 has 4 divisors (see below), whose sum is σ = 1968912. Its totient is φ = 1953472.

The previous prime is 1961173. The next prime is 1961213. The reversal of 1961191 is 1911691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1911691 = 23 ⋅83117.

It is a cyclic number.

It is not a de Polignac number, because 1961191 - 2¹⁷ = 1830119 is a prime.

It is a pancake number, because a pancake can be divided into 1961191 parts by 1980 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961131) 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, 3466 + ... + 3991.

It is an arithmetic number, because the mean of its divisors is an integer number (492228).

2^1961191 is an apocalyptic number.

1961191 is a deficient number, since it is larger than the sum of its proper divisors (7721).

1961191 is an equidigital number, since it uses as much as digits as its factorization.

1961191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7720.

The product of its digits is 486, while the sum is 28.

The square root of 1961191 is about 1400.4252925451. The cubic root of 1961191 is about 125.1718383311.

The spelling of 1961191 in words is "one million, nine hundred sixty-one thousand, one hundred ninety-one".