1961089 has 8 divisors (see below), whose sum is σ = 2147432. Its totient is φ = 1779840.

The previous prime is 1961083. The next prime is 1961093. The reversal of 1961089 is 9801691.

It can be written as a sum of positive squares in 4 ways, for example, as 1089 + 1960000 = 33^2 + 1400^2 .

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 1961089 - 2⁷ = 1960961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444 + ... + 2029.

It is an arithmetic number, because the mean of its divisors is an integer number (268429).

2^1961089 is an apocalyptic number.

It is an amenable number.

1961089 is a deficient number, since it is larger than the sum of its proper divisors (186343).

1961089 is a wasteful number, since it uses less digits than its factorization.

1961089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2547.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1961089 is about 1400.3888745631. The cubic root of 1961089 is about 125.1696682639.

Subtracting from 1961089 its product of nonzero digits (3888), we obtain a square (1957201 = 1399²).

It can be divided in two parts, 196 and 1089, that multiplied together give a square (213444 = 462²).

The spelling of 1961089 in words is "one million, nine hundred sixty-one thousand, eighty-nine".