231207691 has 32 divisors (see below), whose sum is σ = 283852800. Its totient is φ = 185431680.

The previous prime is 231207653. The next prime is 231207719. The reversal of 231207691 is 196702132.

It is a cyclic number.

It is not a de Polignac number, because 231207691 - 2⁷ = 231207563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231207491) 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 31 ways as a sum of consecutive naturals, for example, 526450 + ... + 526888.

It is an arithmetic number, because the mean of its divisors is an integer number (8870400).

Almost surely, 2^231207691 is an apocalyptic number.

231207691 is a deficient number, since it is larger than the sum of its proper divisors (52645109).

231207691 is a wasteful number, since it uses less digits than its factorization.

231207691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 231207691 is about 15205.5151507603. The cubic root of 231207691 is about 613.7630776080.

The spelling of 231207691 in words is "two hundred thirty-one million, two hundred seven thousand, six hundred ninety-one".