2312021391 has 4 divisors (see below), whose sum is σ = 3082695192. Its totient is φ = 1541347592.

The previous prime is 2312021339. The next prime is 2312021399. The reversal of 2312021391 is 1931202132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2312021391 - 2¹⁰ = 2312020367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2312021399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385336896 + ... + 385336901.

It is an arithmetic number, because the mean of its divisors is an integer number (770673798).

Almost surely, 2^2312021391 is an apocalyptic number.

2312021391 is a deficient number, since it is larger than the sum of its proper divisors (770673801).

2312021391 is an equidigital number, since it uses as much as digits as its factorization.

2312021391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770673800.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 2312021391 is about 48083.4835572466. The cubic root of 2312021391 is about 1322.3018817171.

The spelling of 2312021391 in words is "two billion, three hundred twelve million, twenty-one thousand, three hundred ninety-one".