1361603 has 2 divisors, whose sum is σ = 1361604. Its totient is φ = 1361602.

The previous prime is 1361599. The next prime is 1361609. The reversal of 1361603 is 3061631.

It is a weak prime.

It is an emirp because it is prime and its reverse (3061631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1361603 - 2² = 1361599 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1361609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680801 + 680802.

It is an arithmetic number, because the mean of its divisors is an integer number (680802).

2^1361603 is an apocalyptic number.

1361603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361603 is an equidigital number, since it uses as much as digits as its factorization.

1361603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 1361603 is about 1166.8774571479. The cubic root of 1361603 is about 110.8366778094.

It can be divided in two parts, 13 and 61603, that added together give a palindrome (61616).

The spelling of 1361603 in words is "one million, three hundred sixty-one thousand, six hundred three".