1351591 has 4 divisors (see below), whose sum is σ = 1371832. Its totient is φ = 1331352.

The previous prime is 1351589. The next prime is 1351621. The reversal of 1351591 is 1951531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1951531 = 433 ⋅4507.

It is a cyclic number.

It is not a de Polignac number, because 1351591 - 2¹ = 1351589 is a prime.

It is a Duffinian number.

1351591 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351541) 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, 10020 + ... + 10153.

It is an arithmetic number, because the mean of its divisors is an integer number (342958).

2^1351591 is an apocalyptic number.

1351591 is a deficient number, since it is larger than the sum of its proper divisors (20241).

1351591 is an equidigital number, since it uses as much as digits as its factorization.

1351591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20240.

The product of its digits is 675, while the sum is 25.

The square root of 1351591 is about 1162.5794596500. The cubic root of 1351591 is about 110.5643449079.

The spelling of 1351591 in words is "one million, three hundred fifty-one thousand, five hundred ninety-one".