1361663 has 4 divisors (see below), whose sum is σ = 1369368. Its totient is φ = 1353960.

The previous prime is 1361629. The next prime is 1361677. The reversal of 1361663 is 3661631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3661631 = 37 ⋅98963.

It is a cyclic number.

It is not a de Polignac number, because 1361663 - 2⁶ = 1361599 is a prime.

It is a super-2 number, since 2×1361663² = 3708252251138, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361603) 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, 3581 + ... + 3942.

It is an arithmetic number, because the mean of its divisors is an integer number (342342).

2^1361663 is an apocalyptic number.

1361663 is a deficient number, since it is larger than the sum of its proper divisors (7705).

1361663 is an equidigital number, since it uses as much as digits as its factorization.

1361663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7704.

The product of its digits is 1944, while the sum is 26.

The square root of 1361663 is about 1166.9031665053. The cubic root of 1361663 is about 110.8383058177.

Subtracting 1361663 from its reverse (3661631), we obtain a cube (2299968 = 132³).

The spelling of 1361663 in words is "one million, three hundred sixty-one thousand, six hundred sixty-three".