1331285191 has 2 divisors, whose sum is σ = 1331285192. Its totient is φ = 1331285190.

The previous prime is 1331285183. The next prime is 1331285201. The reversal of 1331285191 is 1915821331.

It is a weak prime.

It is an emirp because it is prime and its reverse (1915821331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331285191 - 2³ = 1331285183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331286191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665642595 + 665642596.

It is an arithmetic number, because the mean of its divisors is an integer number (665642596).

Almost surely, 2^1331285191 is an apocalyptic number.

1331285191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331285191 is an equidigital number, since it uses as much as digits as its factorization.

1331285191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 34.

The square root of 1331285191 is about 36486.7810446468. The cubic root of 1331285191 is about 1100.0785594031.

The spelling of 1331285191 in words is "one billion, three hundred thirty-one million, two hundred eighty-five thousand, one hundred ninety-one".