1355691 has 4 divisors (see below), whose sum is σ = 1807592. Its totient is φ = 903792.

The previous prime is 1355681. The next prime is 1355693. The reversal of 1355691 is 1965531.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1355691 - 2⁵ = 1355659 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355693) 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, 225946 + ... + 225951.

It is an arithmetic number, because the mean of its divisors is an integer number (451898).

2^1355691 is an apocalyptic number.

1355691 is a deficient number, since it is larger than the sum of its proper divisors (451901).

1355691 is an equidigital number, since it uses as much as digits as its factorization.

1355691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451900.

The product of its digits is 4050, while the sum is 30.

The square root of 1355691 is about 1164.3414447661. The cubic root of 1355691 is about 110.6760296348.

The spelling of 1355691 in words is "one million, three hundred fifty-five thousand, six hundred ninety-one".