1961791 has 4 divisors (see below), whose sum is σ = 2112712. Its totient is φ = 1810872.

The previous prime is 1961767. The next prime is 1961797. The reversal of 1961791 is 1971691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1961791 - 2⁵ = 1961759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75441 + ... + 75466.

It is an arithmetic number, because the mean of its divisors is an integer number (528178).

2^1961791 is an apocalyptic number.

1961791 is a deficient number, since it is larger than the sum of its proper divisors (150921).

1961791 is a wasteful number, since it uses less digits than its factorization.

1961791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150920.

The product of its digits is 3402, while the sum is 34.

The square root of 1961791 is about 1400.6394968014. The cubic root of 1961791 is about 125.1846019095.

The spelling of 1961791 in words is "one million, nine hundred sixty-one thousand, seven hundred ninety-one".