231126991 has 8 divisors (see below), whose sum is σ = 233089920. Its totient is φ = 229171032.

The previous prime is 231126989. The next prime is 231127007. The reversal of 231126991 is 199621132.

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

It is a cyclic number.

It is not a de Polignac number, because 231126991 - 2¹ = 231126989 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 (231126941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80580 + ... + 83398.

It is an arithmetic number, because the mean of its divisors is an integer number (29136240).

Almost surely, 2^231126991 is an apocalyptic number.

231126991 is a deficient number, since it is larger than the sum of its proper divisors (1962929).

231126991 is a wasteful number, since it uses less digits than its factorization.

231126991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3485.

The product of its digits is 5832, while the sum is 34.

The square root of 231126991 is about 15202.8612767466. The cubic root of 231126991 is about 613.6916606583.

It can be divided in two parts, 23112 and 6991, that added together give a palindrome (30103).

The spelling of 231126991 in words is "two hundred thirty-one million, one hundred twenty-six thousand, nine hundred ninety-one".