1361553 has 4 divisors (see below), whose sum is σ = 1815408. Its totient is φ = 907700.

The previous prime is 1361533. The next prime is 1361573. The reversal of 1361553 is 3551631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3551631 = 3 ⋅1183877.

It is an interprime number because it is at equal distance from previous prime (1361533) and next prime (1361573).

It is a cyclic number.

It is not a de Polignac number, because 1361553 - 2¹⁰ = 1360529 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1361533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226923 + ... + 226928.

It is an arithmetic number, because the mean of its divisors is an integer number (453852).

2^1361553 is an apocalyptic number.

It is an amenable number.

1361553 is a deficient number, since it is larger than the sum of its proper divisors (453855).

1361553 is an equidigital number, since it uses as much as digits as its factorization.

1361553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453854.

The product of its digits is 1350, while the sum is 24.

The square root of 1361553 is about 1166.8560322508. The cubic root of 1361553 is about 110.8353210993.

The spelling of 1361553 in words is "one million, three hundred sixty-one thousand, five hundred fifty-three".