1353991 has 8 divisors (see below), whose sum is σ = 1406160. Its totient is φ = 1302912.

The previous prime is 1353983. The next prime is 1354007. The reversal of 1353991 is 1993531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1353991 - 2³ = 1353983 is a prime.

It is an Ulam 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 (1353901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2911 + ... + 3343.

It is an arithmetic number, because the mean of its divisors is an integer number (175770).

2^1353991 is an apocalyptic number.

1353991 is a deficient number, since it is larger than the sum of its proper divisors (52169).

1353991 is an equidigital number, since it uses as much as digits as its factorization.

1353991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545.

The product of its digits is 3645, while the sum is 31.

The square root of 1353991 is about 1163.6111893584. The cubic root of 1353991 is about 110.6297486976.

The spelling of 1353991 in words is "one million, three hundred fifty-three thousand, nine hundred ninety-one".