1355791247 has 4 divisors (see below), whose sum is σ = 1387321320. Its totient is φ = 1324261176.

The previous prime is 1355791223. The next prime is 1355791253. The reversal of 1355791247 is 7421975531.

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

It is a cyclic number.

It is not a de Polignac number, because 1355791247 - 2²⁰ = 1354742671 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1355791198 and 1355791207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355791207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15764972 + ... + 15765057.

It is an arithmetic number, because the mean of its divisors is an integer number (346830330).

Almost surely, 2^1355791247 is an apocalyptic number.

1355791247 is a deficient number, since it is larger than the sum of its proper divisors (31530073).

1355791247 is an equidigital number, since it uses as much as digits as its factorization.

1355791247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31530072.

The product of its digits is 264600, while the sum is 44.

The square root of 1355791247 is about 36821.0706932865. The cubic root of 1355791247 is about 1106.7875755886.

The spelling of 1355791247 in words is "one billion, three hundred fifty-five million, seven hundred ninety-one thousand, two hundred forty-seven".