231011391 has 8 divisors (see below), whose sum is σ = 331708720. Its totient is φ = 142160832.

The previous prime is 231011383. The next prime is 231011393. The reversal of 231011391 is 193110132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231011391 - 2³ = 231011383 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 (231011393) 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 7 ways as a sum of consecutive naturals, for example, 2961646 + ... + 2961723.

It is an arithmetic number, because the mean of its divisors is an integer number (41463590).

Almost surely, 2^231011391 is an apocalyptic number.

231011391 is a deficient number, since it is larger than the sum of its proper divisors (100697329).

231011391 is a wasteful number, since it uses less digits than its factorization.

231011391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5923385.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 231011391 is about 15199.0588853389. The cubic root of 231011391 is about 613.5893293432.

The spelling of 231011391 in words is "two hundred thirty-one million, eleven thousand, three hundred ninety-one".