1331412191 has 2 divisors, whose sum is σ = 1331412192. Its totient is φ = 1331412190.

The previous prime is 1331412073. The next prime is 1331412223. The reversal of 1331412191 is 1912141331.

It is a strong prime.

It is an emirp because it is prime and its reverse (1912141331) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331412191 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1331412191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331412391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665706095 + 665706096.

It is an arithmetic number, because the mean of its divisors is an integer number (665706096).

Almost surely, 2^1331412191 is an apocalyptic number.

1331412191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331412191 is an equidigital number, since it uses as much as digits as its factorization.

1331412191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 1331412191 is about 36488.5213594632. The cubic root of 1331412191 is about 1100.1135395200.

The spelling of 1331412191 in words is "one billion, three hundred thirty-one million, four hundred twelve thousand, one hundred ninety-one".