231056387 has 4 divisors (see below), whose sum is σ = 233344176. Its totient is φ = 228768600.

The previous prime is 231056383. The next prime is 231056389. The reversal of 231056387 is 783650132.

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 231056387 - 2² = 231056383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231056381) 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, 1143743 + ... + 1143944.

It is an arithmetic number, because the mean of its divisors is an integer number (58336044).

Almost surely, 2^231056387 is an apocalyptic number.

231056387 is a deficient number, since it is larger than the sum of its proper divisors (2287789).

231056387 is a wasteful number, since it uses less digits than its factorization.

231056387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2287788.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 231056387 is about 15200.5390364947. The cubic root of 231056387 is about 613.6291647138.

It can be divided in two parts, 23105 and 6387, that added together give a palindrome (29492).

The spelling of 231056387 in words is "two hundred thirty-one million, fifty-six thousand, three hundred eighty-seven".