1356661 has 4 divisors (see below), whose sum is σ = 1360800. Its totient is φ = 1352524.

The previous prime is 1356659. The next prime is 1356671. The reversal of 1356661 is 1666531.

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.

It is a cyclic number.

It is not a de Polignac number, because 1356661 - 2¹ = 1356659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1356611) 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, 1531 + ... + 2248.

It is an arithmetic number, because the mean of its divisors is an integer number (340200).

2^1356661 is an apocalyptic number.

It is an amenable number.

1356661 is a deficient number, since it is larger than the sum of its proper divisors (4139).

1356661 is an equidigital number, since it uses as much as digits as its factorization.

1356661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138.

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

The square root of 1356661 is about 1164.7579147617. The cubic root of 1356661 is about 110.7024196589.

The spelling of 1356661 in words is "one million, three hundred fifty-six thousand, six hundred sixty-one".