1311411997 has 4 divisors (see below), whose sum is σ = 1498756576. Its totient is φ = 1124067420.

The previous prime is 1311411991. The next prime is 1311412007. The reversal of 1311411997 is 7991141131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7991141131 = 181 ⋅44149951.

It is not a de Polignac number, because 1311411997 - 2³ = 1311411989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311411991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93672279 + ... + 93672292.

It is an arithmetic number, because the mean of its divisors is an integer number (374689144).

Almost surely, 2^1311411997 is an apocalyptic number.

It is an amenable number.

1311411997 is a deficient number, since it is larger than the sum of its proper divisors (187344579).

1311411997 is an equidigital number, since it uses as much as digits as its factorization.

1311411997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187344578.

The product of its digits is 6804, while the sum is 37.

The square root of 1311411997 is about 36213.4228843394. The cubic root of 1311411997 is about 1094.5771661017.

The spelling of 1311411997 in words is "one billion, three hundred eleven million, four hundred eleven thousand, nine hundred ninety-seven".