1961811 has 6 divisors (see below), whose sum is σ = 2833740. Its totient is φ = 1307868.

The previous prime is 1961797. The next prime is 1961819. The reversal of 1961811 is 1181691.

It is not a de Polignac number, because 1961811 - 2⁶ = 1961747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1961819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108981 + ... + 108998.

It is an arithmetic number, because the mean of its divisors is an integer number (472290).

2^1961811 is an apocalyptic number.

1961811 is a deficient number, since it is larger than the sum of its proper divisors (871929).

1961811 is a wasteful number, since it uses less digits than its factorization.

1961811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217985 (or 217982 counting only the distinct ones).

The product of its digits is 432, while the sum is 27.

The square root of 1961811 is about 1400.6466363791. The cubic root of 1961811 is about 125.1850273173.

It can be divided in two parts, 1961 and 811, that added together give a palindrome (2772).

The spelling of 1961811 in words is "one million, nine hundred sixty-one thousand, eight hundred eleven".