1955561 has 8 divisors (see below), whose sum is σ = 2127240. Its totient is φ = 1790208.

The previous prime is 1955543. The next prime is 1955579. The reversal of 1955561 is 1655591.

It is an interprime number because it is at equal distance from previous prime (1955543) and next prime (1955579).

It can be written as a sum of positive squares in 4 ways, for example, as 609961 + 1345600 = 781^2 + 1160^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-1955561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1955501) 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, 926 + ... + 2183.

It is an arithmetic number, because the mean of its divisors is an integer number (265905).

2^1955561 is an apocalyptic number.

It is an amenable number.

1955561 is a deficient number, since it is larger than the sum of its proper divisors (171679).

1955561 is a wasteful number, since it uses less digits than its factorization.

1955561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3163.

The product of its digits is 6750, while the sum is 32.

The square root of 1955561 is about 1398.4137442116. The cubic root of 1955561 is about 125.0519464096.

The spelling of 1955561 in words is "one million, nine hundred fifty-five thousand, five hundred sixty-one".