1361566 has 4 divisors (see below), whose sum is σ = 2042352. Its totient is φ = 680782.

The previous prime is 1361533. The next prime is 1361573. The reversal of 1361566 is 6651631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6651631 = 7 ⋅950233.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 340390 + ... + 340393.

It is an arithmetic number, because the mean of its divisors is an integer number (510588).

2^1361566 is an apocalyptic number.

1361566 is a deficient number, since it is larger than the sum of its proper divisors (680786).

1361566 is an equidigital number, since it uses as much as digits as its factorization.

1361566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680785.

The product of its digits is 3240, while the sum is 28.

The square root of 1361566 is about 1166.8616027619. The cubic root of 1361566 is about 110.8356738471.

The spelling of 1361566 in words is "one million, three hundred sixty-one thousand, five hundred sixty-six".