1353661 has 4 divisors (see below), whose sum is σ = 1359072. Its totient is φ = 1348252.

The previous prime is 1353641. The next prime is 1353679. The reversal of 1353661 is 1663531.

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: 1663531 = 61 ⋅27271.

It is a cyclic number.

It is not a de Polignac number, because 1353661 - 2⁵ = 1353629 is a prime.

It is a Duffinian number.

1353661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1353641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2311 + ... + 2836.

It is an arithmetic number, because the mean of its divisors is an integer number (339768).

2^1353661 is an apocalyptic number.

It is an amenable number.

1353661 is a deficient number, since it is larger than the sum of its proper divisors (5411).

1353661 is an equidigital number, since it uses as much as digits as its factorization.

1353661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5410.

The product of its digits is 1620, while the sum is 25.

The square root of 1353661 is about 1163.4693807746. The cubic root of 1353661 is about 110.6207602618.

The spelling of 1353661 in words is "one million, three hundred fifty-three thousand, six hundred sixty-one".