1397312311 has 4 divisors (see below), whose sum is σ = 1410131800. Its totient is φ = 1384492824.

The previous prime is 1397312309. The next prime is 1397312327. The reversal of 1397312311 is 1132137931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1132137931 = 29 ⋅39039239.

It is a cyclic number.

It is not a de Polignac number, because 1397312311 - 2¹ = 1397312309 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 (1397312381) 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, 6409581 + ... + 6409798.

It is an arithmetic number, because the mean of its divisors is an integer number (352532950).

Almost surely, 2^1397312311 is an apocalyptic number.

1397312311 is a deficient number, since it is larger than the sum of its proper divisors (12819489).

1397312311 is a wasteful number, since it uses less digits than its factorization.

1397312311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12819488.

The product of its digits is 3402, while the sum is 31.

The square root of 1397312311 is about 37380.6408586049. The cubic root of 1397312311 is about 1117.9726053965.

The spelling of 1397312311 in words is "one billion, three hundred ninety-seven million, three hundred twelve thousand, three hundred eleven".