311201389 has 4 divisors (see below), whose sum is σ = 311241280. Its totient is φ = 311161500.

The previous prime is 311201381. The next prime is 311201411. The reversal of 311201389 is 983102113.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 311201389 - 2³ = 311201381 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 (311201381) 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, 3987 + ... + 25264.

It is an arithmetic number, because the mean of its divisors is an integer number (77810320).

Almost surely, 2^311201389 is an apocalyptic number.

It is an amenable number.

311201389 is a deficient number, since it is larger than the sum of its proper divisors (39891).

311201389 is a wasteful number, since it uses less digits than its factorization.

311201389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39890.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 311201389 is about 17640.9010257413. The cubic root of 311201389 is about 677.6631063837.

The spelling of 311201389 in words is "three hundred eleven million, two hundred one thousand, three hundred eighty-nine".